ABOUT: Getting new rims? All the info you need here

[Rupewrecht]

The series is only part of the rolling diameter. it combined with the width determines the rolling diameter. series is how tall the sidewall is in percentage compaired to the width.

Tyres are labeled www/hh/rr lls

Where www is the overall width of the tyre in mm

hh is the height of the side wall from the rim to the outermost point and is expressed as a ratio of the width (see twilightproteges post)

rr the total diamater of the rim in inches (some BMW use mm but they are rare and obvious), multipy by 25.4 to convert to mm

ll is the load rating, the higher the number the higher the load rating

s is the speed rating, a letter, the closer to 'Z' the higher the speed rating

So the diamater of the standard BA 1.8 185/65/14 is 65% of 185 = 120.25mm top and bottom of the rim = 240.5mm plus the 14" rim (355.6mm).
Total 596.1mm
BA alloy option 195/55/15 is 55% of 195 = 107.25mm top and bottom of the rim = 214.5mm plus the 15" rim (381mm).
Total 595.5mm

Use this to calculate your original diamater then you can make variations to plan

http://www.miata.net/garage/tirecalc.html

and calculate the offset you need here

http://www.1010tires.com/WheelOffsetCalculator.asp


Or this one which does both:

http://www.rims-n-tires.com/rt_specs.jsp

[Cosmo Dude]

Stage two, I've taken this from an American book about 20 years old but the information is sound (all be it in inches and MPH)

Tires Are “Gears” Too!
Having the latest hot-tip racing tire is nice — but not if its diameter fouls up your gear ratio. Can’t happen, huh? OK try this. You’ve been running the 5.50-9.20—14 tires on your 510 with a 4.11 rear gear. These have about 24.12- inch diameter at 24 PSI inflation. Get a gear/tire size computer wheel. This little circular slide rule calculator puts the whole thing in your pocket so you can impress your team mates and fellow racers with your knowledge of what’s happening. Set the tire diameter next to the gear ratio, then find 7,000 driveline RPM (same as engine RPM because this is measured in 4th gear, which is 1:1). Read the top speed (4th gear) of about 121 MPH.
Your ex-wife loses grasp of things one afternoon and write you an alimony check. You squander this new found fortune on a set of 10.45—14 tires with a shorter diameter (only 22.4 inches) than you had been running. Play the computer wheel game again and you’ll see that 7,000 RPM now gives 111 MPH. This might help you on a short track where you didn’t use much 4th gear — but if the next race features two long straightaways, you’ve got to figure out what to do. Change rear gears, twist the engine tighter, go back to a taller tire or just be content to finish somewhere in the pack with what you already have in the tire and gear departments? You might be better of leaving your new tires in their wrappers!

A 510 is the old Datsun 1600 '68-'73

[DunkyMonkey]

okay i didn't understand that, but thats why your supose to keep the same rolling diameter!!!!! thanks for the sites tho, i need to see pricing for tyres too they are expensive

[Cosmo Dude]

Tyres are what you pay for them, you can get cheap tyres that last a long time but they won't offer much in the way of grip, or you can buy Yokohama semi slicks (just road legal) which stick like you wouldn't believe but last 5000km if your lucky. Best people to quote you on tyre prices would be your local tyre shop, give 'em a call

[ezin]

hahahaha! LMAO luv'd that explination! Nice work! U get to understand the same thing in grand turismo3 when setting all the gear ratio's! One race u luv it, the next u just keep watching the pack pull away!

[Andy's SP20 Astina]

okay i didn't understand that, but thats why your supose to keep the same rolling diameter!!!!! thanks for the sites tho, i need to see pricing for tyres too they are expensive



Its mainly to keep your speedo reasonably accurate by fittng tyres of the same rolling diameter.

[Cosmo Dude]

Wheel offset calculator (http://toy4two.home.mindspring.com/offset.html)
Wheel offset explained (http://www.usacomp.com/Offset.htm)
Hope this helps

[Rupewrecht]

And a guide to Markings, Speed Ratings and Load Ratings

http://www.blackcircles.com/general/sidewall

Important when you've got a bloody BA with a ridiculously high load rating!

[pr1mo]

hey its not that bad. integras and civics are 87

[Ripper323]

When the sidewall height is indicated, ie 35, does it include the tyre bead in it's height? I ask this because my tyres are 215/35/18 and by the calculation I should have a sidewall height of 75mm, but my sidewalls are no where near that big. I think they would be lucky to be 50mm from the edge of the rim to the tread.

[Rupewrecht]

Offsets and Stud Patterns:

BA Astina Hatch + Hardtop

I4 - 4x100 stud pattern, +45 offset
V6 - 5x114.3 stud pattern, +45 offset

Feel free to add BG and BJ, peoples

[Ripper323]

BJ Astina (non SP20)

4x100 +45 offset

[Rupewrecht]

Updated with an online offset calculator in the first post.

[couchy]

will 18 x 8 wheels fit a hardtop if they're only 42 offset?
I know this is probably explained somewhere above but I'm not really mechanicly minded at all.
Cheers Couchy

[project.r.racing]

thats what the offset calculater above is for, use it.

[RedLineResident]

Offsets and Stud Patterns:

BA Astina Hatch + Hardtop

I4 - 4x100 stud pattern, +45 offset
V6 - 5x114.3 stud pattern, +45 offset

Feel free to add BG and BJ, peoples

+45 offset? Is offset tire wall. Ive been trying to work out the terminology, ive assumed things in the past but never been sure. If the BHA run a 45mm tirewall then ive F***ed up when getting new tires. But the ive always kind of known that.

[Rupewrecht]

Offset is disatnce from the centre of the rim to the point where the hub bolts to the rim. Check out the link at the top for a diagram.

As for 8" wide rims and +42, you'd have to test fit them...but i reckon they'll rub on the struts!

[pr1mo]

7" wide is as far you can go with the 45+ offset mine nearly hit the struts with this configuration

[couchy]

would definitely rub i think after looking at the clearance i have on the 7" 17's i have now.
I did check the calculator above,,, and these wheels would be 11 mms closer to the strut and there isn't that much room now.
Would aftermarket struts or coilovers give more clearance?

[Rupewrecht]

Depends how low you're running the coilovers - as the adjusting collars are level with the rim lip on mine, and i have about 8mm clearance with +37 rims.

[Rupewrecht]

Added a new offset/wheel width/tyre size calculator i found - very cool!

http://www.rims-n-tires.com/rt_specs.jsp

[barby]

i know this has been asked before but what is the offset for 03 sp20 thanks guys

[Protege03]

http://www.astinagt.com/forums/showthread.php?t=10400&highlight=sp20+offset

read that..

[dfrench187]

I'm not real goot with offset tyre sizes etc. and can't really work out the calculator.

But i was thinking of putting 18"x8" Rims on my mrs '95 BA Astina Hatch. Is this possible? or do i have 2 have 18"x7.5"?

What tyre/rim/offset sizes do you guys reccomend?

[phly]

I reckon u should stick to 18x7.5 if you have strut type shocks. I've got 18x7.5 with 215/35/18 tyres and theres barely any space between the wheel and the strut. Not sure what my offset is but i think its around 40mm.

[Mooa42]

Offsets and Stud Patterns:

BA Astina Hatch + Hardtop

I4 - 4x100 stud pattern, +45 offset
V6 - 5x114.3 stud pattern, +45 offset

Feel free to add BG and BJ, peoples

To make the tyre calc work we really need to know the rim widths too.
Does anyone know standard BA V6 rim widths?
Even better does anyone know the distance from the mounting surface to the standard strut?
Or what other wheels fit? Skyline, etc etc

[project.r.racing]

I4 - 14x5.5, 15x6
V6 - 16x6 (maybe 6.5)

or if you are unsure, go to your garage and have a look yourself

and the measurements you just asked for, dont be lazy, your car is in the garage, get the measuring tape out.

[Rupewrecht]

I4 - 14x5.5, 15x6
V6 - 16x6 (maybe 7)

V6 = 16x6.5 IIRC.

[Mooa42]

I4 - 14x5.5, 15x6
V6 - 16x6 (maybe 6.5)

or if you are unsure, go to your garage and have a look yourself

and the measurements you just asked for, dont be lazy, your car is in the garage, get the measuring tape out.

:) Not at home ATM I'm interstate, just bored looking for wheels while I wait for a plane. Did I see somewhere that you had an LSD?? If so what did you get/how much etc? (me being lazy again, I could search but ... well ... I'm lazy)

Thanks Rupewrecht

[Mad Mat]

hey guys. i just stumbled across this. thought it might be a little handy ;)

http://soarercentral.com/sc-forum/messages/283/1565.html

[dwpny]

Hello, I'm sorry for being one of those morons who can't figure anything out regarding offset and all that stufff. Is it uncool to just follow the directions on the plate on my car that says what tyres can fit on a 14 inch rim and on a 15 inch rim? Or can you guys help me to get a wider tyre than a 195 60 R15? (Or is it 195/55/r15)

[project.r.racing]

Hello, I'm sorry for being one of those morons who can't figure anything out regarding offset and all that stufff. Is it uncool to just follow the directions on the plate on my car that says what tyres can fit on a 14 inch rim and on a 15 inch rim? Or can you guys help me to get a wider tyre than a 195 60 R15? (Or is it 195/55/r15)re ask the question, and think about it before typing it first.

[Cosmo Dude]

Legally you can increase wheel diameter by up to 1" and width by 0.5"
The V6 has factory 16"x6.5" so 17"x7" is about as big as you can legally go without an engineers report. Practically though 205 tires are what will fit between the guards if you don't want to do a lot of number crunching and chasing rims with perfect offsets.
BTW, it doesn't matter if you have an I4 or V6 the chassis is the same.

[project.r.racing]

Legally you can increase wheel diameter by up to 1" and width by 0.5"actually in victoria - it is +15mm/-15mm overall diameter and +25mm max width.

so running 215/35R18 on a 18x7.5 rim would be biggest on a I4 Astina. +42mm to +45mm offset is the way to go.

[frizky101]

sorrry but i have no idea how to use those calculator thingos..:(

could someone tell me what the specs would be for a BJ 98 model?

im wanting to get 18's but im worrried about scrubbing of the guards.

what would be the specs for 18's and 17's?

cheers guys

[Putonyourshoes]

you could probably do 8 inch wide with an offset of about 45.. the tires will be more of an issue though. maybe someone else can help with those

[marcs_sp20]

17"x7.5" rim, with 42-45 offset would be best...

If you an 8" wide rim, expect to have to lip the rear guards as they'll scrub ;)

Cheers
Marc

[frizky101]

sweet, thanks mate.

so 18's are a no no im guessing?

[marcs_sp20]

you can, but you might have problems with legalities...

[70NYD]

you should be right 18s are sort of legal as you chassis comes with 16s standard for the sp20 am i not correct? or is it 15s.. eithr way 18 is max, well for me anyway, the ba v6 comes with 15s and the bloke at blowjobTmart said going from 15 stock 18 is largest or some thing.. if you do get 18s, 7.5 is a good width ;)

[tacety]

could someone please tell me the stud pattern for a 91 bg non sp please im so desperate lol

[so fresh]

could someone please tell me the stud pattern for a 91 bg non sp please im so desperate lol

4x100 (hope dats what your after)

[Dutchy]

Hey Guys,

Just thought i would post up the specs i found for a BG. As i couldnt really see it plainly written out here. So just for reference:

BG Astina SP 1989-1994
Standard/OEM wheel:
14x5.5JJ OFFSET +45
with a 4x100 stud pattern
Standard tyres are listed as either: 175/65/14 or 185/60/14

Although i have got these specs off the SP astina i believe that they should be the same for the base model astina, shades and the 323 sedan.

Hope that helps someone in the future. :)

Cheers
Jeremy

[S373N]

My new 2ndhand wheels I got today have same everything. Stud pattern, width etc.
The holes for studs are a tad smaller than the others so my tyre iron didn't fit so used socket wrench.
Anyways.. Driving along, steering wheel shaky as hell and getting a thuds every half second.

Any ideas on a cause???

[marcs_sp20]

get a wheel alignment and tyres balanced, Also check your tie rod ends ;)

[S373N]

They're All possibilites but I thought maybe if it was the rod ends I'd have some sort o problem by now already

[S373N]

I've found the problem. Old spacers from the alloys were still there. Fit like a glove now. Obviously :p I'm a duffer

[Duke]

Idea's

Thinking of going 15x7
+30 rear
+35 front

astina v6 (stock is around 45ish' yes?)

Anyone used similar specs? Rims would be made to order, so i can go anywhere between +20 to +40

[Rupewrecht]

Yeah, stock is +45.

Mazdaspeed fitment was 16x7 +35 all round to give you an idea.

[Duke]

Okay sooo

16x7 +45
16x8 +45

Fitment?

These are BBS RS... i kind of need them... FOR MY LIFE

[Rupewrecht]

16x8 +45 isn't going to happen - you'll be rubbing struts. It'd have to be at least a +38 with an 8" rim, and even then you'll only have a few mm clearance.

[Duke]

What about with coilovers? Would that help with strut clearence? I could always run a small spacer...

[Rupewrecht]

BBS RS are not that uncommon, you know. :p Easier to just find a better fitment.

Coilovers would help, but not by much. And then if you're running them low, the collars will the close to the rim anyway which negates the extra few mm clearance.

[Duke]

rupe if u can get me a set in 16x7 +35ish for 5 stud, im looking to spend about $1100.

Ive been looking for weeks, such a bitch to find in 5x114.3 <17"

[Rupewrecht]

rupe if u can get me a set in 16x7 +35ish for 5 stud, im looking to spend about $1100.

Ive been looking for weeks, such a bitch to find in 5x114.3 <17"

You'll have a PM shortly

[marcs_sp20]

Just an FYI, the rims-n-tires link doesnt show you whats the difference between 2 rim sizes no more, you have to pay for the privelege, bastards!

[Rupewrecht]

Just an FYI, the rims-n-tires link doesnt show you whats the difference between 2 rim sizes no more, you have to pay for the privelege, bastards!

Only the clearance though, the rest still works.

[project.r.racing]

Idea's

Thinking of going 15x7
+30 rear
+35 front

astina v6 (stock is around 45ish' yes?)

Anyone used similar specs? Rims would be made to order, so i can go anywhere between +20 to +40i just spotted this post.

i use 15x7 +35 for my track wheel/tyre combo.

[mansonitefirefox]

Hey guys, long time reader, first time poster!

I just wanted to double check in case im being too simple about this.

I have a 97 Astina 1.8 with some ugly ass aftermarket rims on them at the moment from previous owner.

From what I have read I would be able to get ANY 17 inch x 7 inch, 4 stud 100mm rim and it would fit nicely on my car? Or is it all about the amount of offset on the rims so they will actually fit?

Then need to make sure i get tires with a low enough profile to ensure the total wheel size is the same and im all good to go?

[Clean_Cookie]

37-45 offset should fit fine with 205/40/17 tyres. 215's would work too...

[mansonitefirefox]

Currently i'm looking to get the following setup on monday from Bob Jane.

Maxxis MA-Z4S Victra 215/40R17 $169 x 4
RJR Quest 17x7 4x100 42 offset $199 x 4

anyone think of anything particularly wrong with that?

[Clean_Cookie]

Those tyres are pretty good. I think I paid $200 a corner. Those rims should for too, but there's cheaper places than Bob Jane...

[mansonitefirefox]

but there's cheaper places than Bob Jane...

Any suggestions?

Basically im looking for a cheap knock-off that is as close to an OZ Racing SUPERTURISMO GT (as far as i'm concerned the most beautiful thing that has ever been on the corners of any car)

Im in Perth WA and really dont wanna do anything online/shipped.

[Clean_Cookie]

I'm afraid online is where its at... Considering you're in Perth, which always seems expensive.

[mansonitefirefox]

does anyone know if a 97 can take a 17x7.5?

http://www.bobjane.com.au/wheelset-details/wheelsetID/731/idm/17/ispt/Wheels/isu/45.html?sid=b8743a30792a8bbe

[Cosmo Dude]

does anyone know if a 97 can take a 17x7.5?

http://www.bobjane.com.au/wheelset-details/wheelsetID/731/idm/17/ispt/Wheels/isu/45.html?sid=b8743a30792a8bbe

Yes 17x7.5 will fit but you really need to know the offset (how much the wheel pokes in or out) too much -ve offset and the inner will hit the suspension too little -ve offset and you'll foul the guard.
Lots of stuff on this here you just have to search.

[mansonitefirefox]

all done.

RJR Wolfrace 12 17x7 with 205/40 Maxxis rubbers

http://img607.imageshack.us/img607/9650/img20111115180543.th.jpg (http://imageshack.us/photo/my-images/607/img20111115180543.jpg/)

[Zenki]

Does anyone know if these mag wheels will fit my 2002 Protege BJ II

http://www.ebay.com.au/itm/17-INCH-RIMS-MAGS-WHEELS-TYRES-MAZDA-3-SP23-SP25-MAZDA-6-SPORTS-LUXURY-UPGRADE-/250926975793?pt=AU_Car_Parts_Accessories&hash=item3a6c69cb31#ht_1250wt_1165

[z100]

Does anyone know if these mag wheels will fit my 2002 Protege BJ II

http://www.ebay.com.au/itm/17-INCH-RIMS-MAGS-WHEELS-TYRES-MAZDA-3-SP23-SP25-MAZDA-6-SPORTS-LUXURY-UPGRADE-/250926975793?pt=AU_Car_Parts_Accessories&hash=item3a6c69cb31#ht_1250wt_1165

Any standard protege will be four stud, these wheels are five stud. If you have an Sp20 they will fit, someone correct me if I'm wrong!

[smurfy]

have no clue when it comes to all these numbers with wheels and tyres ahah

would 17x7.5 48+ with 205/40 tyres fit my sp20?

[project.r.racing]

wheels yes, tyres most likely will have lower than required load rating.

[smurfy]

tyres most likely will have lower than required load rating.

explainn :D

[project.r.racing]

on the tyre placard, in your door jab, it will state that any tyres fitted must be equal to or over a certain load rating. 83/84/85 etc.

BA is 84/615KG, not sure on BJ, but placard will tell you.

most 205/40R17 tyres are 83, small percentage is 84.

no the side of the tyres, the letters should be 205/40ZR17 83 or 205/40R17 83W

the Z and the W are speed ratings, nothing to worry about.

but the 83/84/85 need to be equal or higher than on the placard.

[phildough]

there is an extra number on tyres and it is the load index.
From memory the minimum we can use is 85 from memory.
A lot of tyre shops do not know anything about the load index and incorrectly fit tyres to cars.
If you have an accident and your tyres are below the load index rating your claim can be dismissed as your car should not have been on the road as it was illegal.
My friend just got a set of tyres, I get home check them and tell him to take his car back as they are not legal.
He took it back and had to call me to bring down proof that they knew nothing.
I made him return the tyres and get a full refund and go elsewhere as the tyre shop kept telling me I knew nothing and was wrong.
They sold him tyres rated at 82 and his car is 84 minimum.

[Clean_Cookie]

ive got 83 rated ones on my car atm. yes they are illegal, but the difference between 83-84 was 15kg. so far so good I guess. they were $250 cheaper than an 84 rated set. another reason why I decided to buy 16" rims for my hatch, loads easier to get cheap rated tyres! :)

[shaley323]

ive got 83 rated ones on my car atm. yes they are illegal, but the difference between 83-84 was 15kg. so far so good I guess. they were $250 cheaper than an 84 rated set. another reason why I decided to buy 16" rims for my hatch, loads easier to get cheap rated tyres! :)

not worth the risk, if you're in an accident that you didn't cause you can still be found "at fault" because you are now driving an unroadworthy vehicle, your tyres are the one thing nobody should skimp on.

i want everybody to still be here tomorrow

i worked in the industry doing brakes, suspension, wheel alignments and tyre fitting so i have seen some nice vehicles with s**t tyres and suspension.
way too scary, suspension, tyres, brakes, steering gear and alignment are the components that keep us in control when driving.
for each component we skimp on we reduce the amount of control for the driver.

my rant

[phildough]

Ryan, remind me to tell you off next time I see you!!!

[shaley323]

phil tell ryan off next time you see him =D