TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Posts about anything do to with modifying your car such as fitting aftermarket parts, bodykit, or tuning the engine for more performance.

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skinthespin
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Location: Derbyshire

TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by skinthespin »

There has been some debate on what tyres fit on what size rims. I am fortunate enough to have acces to the ETRTO manual, this manual is written by the European Tyre and Rim Technical Organisation and is used by all manufacturers of full vehicles, rims and tyres. It covers everything from earth moving equipment to space savers and from 18 wheelers to motorbikes. The Manual contains guidelines for fitment, which includes clearance envelopes that manufacturers use when packaging the wheel and tyre (these envelopes cover all known tyre deformations and fling), load ratings, speed rating, tyre and rim construction and of course what size tyres fit on what size rims.

Of course it may be possible to stray outside these guidelines but the tyres wil not be working within their design parameters (same as running very low pressures for example) and a correctly fitting and functioning tyre will always give better results.

I will post up some popular sizes for MR2's, in 15-18 inch, as well as the recommended ETRTO size combination, if you would like more information or I have missed some sizes feel free to ask, I hope its of some use!

55 profile

195/55 x 15 5.5j - 7j Recommended 6j
205/55 x 15 and 16 5.5j - 7.5j Recommeded 6.5j
225/55 x 15 6j - 8j Recommended 7j

50 profile

195/50 x 15 5.5j - 7j Recommended 6j
205/50 x 15, 16 and 17 5.5j - 7.5j Recommended 6.5j
215/50 x 15,16,17 and 18 6j - 7.5j Recommended 7j
225/50 x 15, 16 17 and 18 6j - 8j Recommended 7j

45 profile

195/45 x 15 and 16 6j - 7.5j Recommended 6.5j
205/45 x 15, 16, 17 and 18 6.5j - 7.5j Recommended 7j
215/45 x 15, 16, 17 and 18 7j - 8j Recommended 7j
225/45 x 15, 16, 17 and 18 7j - 8.5j Recommended 7.5j
235/45 x 15, 17 and 18 7.7j - 9j Recommended 8j

40 profile

195/40 x 16 and 17 6.5j - 7.5j Recommended 7j
205/40 x 16, 17 and 18 7j - 8j Recommended 7.5j
215/40 x 15, 16 , 17 and 18 7j - 8.5j Recommended 7.5j
225/40 x 16, 17 and 18 7.5j - 9j Recommended 8j
235/40 x 17 and 18 8j - 9.5j Recommended 8.5j
245/40 x 17 and 18 8j - 9.5j Recommended 8.5j
255/40 x 16, 17 and 18 8.5j - 10j Recommended 9j

35 Profile

215/35 x 16, 17 and 18 7j - 8.5j Recommended 7.5j
225/35 x 17 and 18 7.5j - 9j Recommended 8j
235/35 x 15 and 18 8j-9.5j Recommended 8.5j
245/35 x 15, 16, 17 and 18 8j - 9.5j Recommended 8.5j
255/35 x16 and 18 8.5j - 10j Recommended 9j

If there are any more people would like or any more about ETRTo then feel free to ask.

HTH

PS, please make this a sticky mods, I can then add to it as people ask questions!
Leon.
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Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by Leon. »

I hope you don't mind me jumping on your thead but thought it might also be useful to add information on the closest size tyres to stock rolling radius (RR), for the more common choices.

I thought it made sense to add it here. I have made reference to your info above. If you think there is a better way to show this then let me know, I can always delete my post...

Please note the information I have given is simply conversions using a calculator, and what you decide to run on your car is your own decision! Running a tyre size larger or smaller than stock RR will affect your acceleration, top speed, speedo and fuel effeciency amongst others, allbeit maybe only by a small amount.

You should also remember that whilst a wider tyre within recommendations will give you more grip, this will mean your '2 gives you less warning before losing rear end traction, and this will probably exaggerate the effects. Your choice will therefore affect over-/under-steer behaviours. Remember to take into account ride comfort and cost of tyres when choosing too.

If buying new rims, remember to check they will fit with your setup.

Tyre sizes for the fronts:

15" wheels
195/55/15, 5.5j - 7j recommended 6j (standard size Toyota rev 2 onwards)
205/50/15 = -10mm less than stock RR / 5.5j - 7.5j recommended 6.5j
205/55/15 = +11mm bigger than stock RR / 5.5j - 7.5j recommended 6.5j

16" wheels
205/45/16 = -5mm less than stock RR / 6.5j - 7.5j recommended 7j
215/45/16 = +4mm bigger than stock RR / 7j - 8j Recommended 7j

17" wheels
205/40/17 = 0mm same as stock RR / 7j - 8j recommended 7.5j
215/40/17 = +8mm bigger than stock RR / 7j - 8.5j recommended 7.5j

18" wheels
215/35/18 = +12mm bigger than stock RR / 7j - 8.5j recommended 7.5j

Tyre sizes for the rears:

15" wheels
225/50/15, 6j - 8j recommended 7j (standard size Toyota rev 2 onwards)

16" wheels
215/45/16 = -6mm less than stock RR / 7j - 8j recommended 7j
225/45/16 = +3mm bigger than stock RR / 7j - 8.5j recommended 7.5j
235/45/16 = +12mm bigger than stock RR / not sure of recommendation?
245/40/16 = -4mm less than stock RR / not sure of recommendation?

17" wheels
215/40/17 = -2mm less than stock RR / 7j - 8.5j recommended 7.5j
225/40/17 = +6mm bigger than stock RR / 7.5j - 9j recommended 8j
235/40/17 = +14mm bigger than stock RR / 8j - 9.5j recommended 8.5j
245/40/17 = +22mm bigger than stock RR / 8j - 9.5j recommended 8.5j
245/35/17 = -3mm less than stock RR / 8j - 9.5j recommended 8.5j

18" wheels
225/35/18 = +9mm bigger than stock RR / 7.5j - 9j recommended 8j
235/35/18 = +16mm bigger than stock RR / 8j - 9.5j recommended 8.5j
245/35/18 = +23mm bigger than stock RR / 8j - 9.5j recommended 8.5j

If I have made any mistakes, please let me know!
Last edited by Leon. on Tue Nov 14, 2006 5:31 pm, edited 2 times in total.
EarL
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Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by EarL »

Great posts guys. Really informative. =D>

EarL.
Sable Grey 2004 MkIII Roadster

Once an MR2 owner, ALWAYS an MR2 owner!
raptor95GTS
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Contact:

Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by raptor95GTS »

click me yup done the tyre difference myself, with links from other sites
Last edited by raptor95GTS on Thu Dec 13, 2007 10:03 pm, edited 2 times in total.
Leon.
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Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by Leon. »

Is this not going to be made a sticky :?

Do we have to search for it everytime someone asks about this topic?
poyntesm

Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by poyntesm »

Submit it to the KB. Thats what the KB is there for. Sticky posts are more for site specific topic.
Leon.
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Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by Leon. »

Ah! Didn't know that! Thanks.

Skinthespin, its your thread so do you want to do this? I can also do it on your behalf...
skinthespin
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Location: Derbyshire

Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by skinthespin »

Yeah if you can Leeroy, not sure what to do myself, its a shame it can't be made a sticky though as I think what we have written so far could just be astart point and be aded to by other people, making it much more useful, don't know what other people think but I think things tend to get forgotten in the KB!
poyntesm

Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by poyntesm »

If we had a stickie for every bit of good info we would have a site full of stickies.

The KB is the correct place for it. People can comment on a KB article to add new info to it just like a post.

Things only get forgotten in the KB if people do not link to them when a question that has an answer in the KB is not linked to.

Personally I am going to try push for better topic title & question on the forums and better use of the KB.

To add to the KB follow the link up top...go to the category you feel fits it best. Then click on the submit article. The page is 99% the same as a post.
Leon.
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Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by Leon. »

poyntesm wrote:Things only get forgotten in the KB if people do not link to them when a question that has an answer in the KB is not linked to.


:shock:

In english?

:lol:
skinthespin
Posts: 1833
Joined: Tue Jan 25, 2005 11:04 pm
Location: Derbyshire

Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by skinthespin »

Fair enough poyn. I would be grateful however Leeroy if you could do it as im using a citrix server at work and can't cut and paste!

Cheers

Skinner
TBDevelopments

Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by TBDevelopments »

good info.

Got anything on tyre pressures for different profile tyres, makes etc? compaired to the standard pressues

Tim
xxxx
skinthespin
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Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by skinthespin »

No Tim, the only thing specified on the tyre is the maximum pressure, and pressures are something you really have to just play around with until you get something that feels right. If your not comfortable with that then just run a pressure that someone else has run and just use that as a start point.

The pressures can also vary depending on load conditions (weight of vehicle), driving conditions (track/race/road/snow/mud etc etc), tyres sizes and of course handling requirements.

I guess its something someone could do as a little bit of research I guess, maybe on a trackday?
TBDevelopments

Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by TBDevelopments »

yeah i'll admit its something i don't have any experience in so was wandering what was best.

I'm running 215/35/18 and 245/35/18 eagle f1's at the mo and running 29/32psi similar to standard.

Just wandering if the tyre manufactures set an ideal pressure for there tyre.

Tim
xxxx
skinthespin
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Location: Derbyshire

Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by skinthespin »

No mate, like I say it depends on a number of factors, so just specify a maximum (probably 70psi or thereabouts on your tyres), and vehicle manufacturers fiddle with pressures a bit up to the last minute too.

What you are running seems pretty reasonable though, so all i'd say is just try tweeking it by a couple of psi and see what happens, just use where you are now as a start point. To do it properly is a pain though and time consuming, when we are doing chassis testing you would make one change, record the differences (if any), then make another change and do it all again. Then you might even go back to where you started to check you have actually been making things better, you'd be suprised the amount of times your actually making things worse but have forgotten what they were like in the beginning!
TBDevelopments

Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by TBDevelopments »

yeah i know what you mean, well mines a road going car so getting my suspension all sorted first is going to make the world of difference. The allignments that bad you can visually see its all over the place.

Tim
xxxx
matt_mr2t
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Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by matt_mr2t »

Bummer, I was really hoping ti squeeze some 245/35/18's on my 7.5" rims but looks like I'd be risking serious danger :cry:

Be nice if some one else made 235/35's though, only one brand and they're £180 each!
Leon.
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Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by Leon. »

ok so this is now in the KB. I've made a link to here so that the if this thread is added to, you'll obviously see all useful info.

If and when this thread gets lost and goes under, suppose it might be an idea just to copy and paste the most relevant info into the kb article...
Leon.
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Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by Leon. »

What we are missing here are offset details.

Standard offset and what offsets are required for the wheels to be flush with the arches, depending on what width rims you have, and ideally whether running stock suspension or coilovers. Giving as many options as possible. For example (and these are not correct!):

Coilovers

Front wheels

16" wheels
205/45/16 on 7" wheels will require offset of 35
215/45/16 on 7.5" wheels will require offset of 38

17" wheels
205/40/17 on 7.5" wheels will require offset of 35
215/40/17 on 7" wheels will require offset of 32
215/40/17 on 8" wheels will require offset of 37

18" wheels
....

Rears
....


Standard suspension

Front wheels

16" wheels

17" wheels

....

etc etc.



Can anyone contribute on this?
skinthespin
Posts: 1833
Joined: Tue Jan 25, 2005 11:04 pm
Location: Derbyshire

Re: TYRE SIZES - WHAT TYRES FIT WHAT RIMS - STICKY PLEASE

Post by skinthespin »

I only put down what tyres on what rims as there was so much confusion, I have no idea what offsets are available, but its a good idea as its also something thats asked loads, so go for it ppl!
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