wheel sizes

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wheel sizes

Post  jack on Wed Jul 06, 2011 3:38 pm

will 17 x 10.5 et -20 wheels fit on the back?
and does anybody know how to work out what et/wheel width combo fit our kit because i'm a little lost Embarassed

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Re: wheel sizes

Post  Admin on Wed Jul 06, 2011 11:10 pm

This sort of thing confused me for years but after finally getting to grips with it it doesn't seem that hard now! LOL

Anyway, key thing to remember is that the width of the bodywork at each corner sticks out 30mm more than standard so just use a wheel tyre calculator but what your aiming for is for your wheel to stick out 30mm more than it used to if you want an original look where the tyre still sits inside the arch or to stick out 30mm overflush which will be flush on a widebody for the look on a lot of USA cars).

The wheel tyre calculator I like to use is: http://91mr2.com/wheel-and-tire-calculator/ but to make sense you need to know a tyre size too which will form the overall size of the "wheel" ie. hub + tyre. For this scroll down to the table on this website:

http://www.kouki.co.uk/utilities/visual-tyre-size-calculator

Youll see that for your wheel size of 10.5 the minimum width of tyre is 265mm with a maximum of 295mm with an ideal of 275 or 285. Ive used this reference a few times now and the best size seems to be the upper maximum so in your case this will be a 285mm. (just one thing to note that using the upper maximum gives just a bit of tyre sticking out over the rim which helps prevent kerbing of your rims if you misjudge your parking).

so back to the wheel tyre calculator Click on the 93 MKII button to fill in old original values then just enter your values ie. tyre width 285, sidewall 40 (youd most prob need a lower profile in reality), tw height 17, wheel width 10.5, offset -20 against the back (leave the front) and press calculate.

You'll see the rear flushness is 74mm out from flush so deducting your 30mm for widebody your wheels will still stick out 44mm!

Computer says "NO" :-(




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Re: wheel sizes

Post  jack on Thu Jul 07, 2011 3:33 am

that's a shame Crying or Very sad thanks for that though, very useful information because i was completely lost with it all before! do you happen to know how many mm extra to add to bring the wheel up to the arch without protuding?

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Re: wheel sizes

Post  Admin on Thu Jul 07, 2011 3:49 am

You tell me! LOL

Ill let you work it out....just keeping adding positive amounts to the offset and press calculate until it says its flush (as a hint look at the underflush size and just add that) This is how you work out the size of spacers you can use if you want to fit wheels that would ordinarily rub on your suspension - your just in efffect altering the et with the spacer

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Re: wheel sizes

Post  jack on Thu Jul 07, 2011 2:37 pm

the answer to my question appears to be 10mm to bring it up flush, meaning that potential wheels will have a 10mm bracket for which they will fit... if that makes any sense.

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Re: wheel sizes

Post  Admin on Thu Jul 07, 2011 10:55 pm

Tell me the size your checking and Ill double check

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Re: wheel sizes

Post  jack on Fri Jul 08, 2011 2:35 am

i was just using this calculator because i couldnt get the one in your link to work for some reason http://mr2.gordaen.com/wt_calc.php and using the standard sizes but changing the offset. i think it was et 10 that brought them flush.

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Re: wheel sizes

Post  Admin on Fri Jul 08, 2011 2:51 am

35mm spacers all round will bring standard wheels flush with arches. Just copy sizes from top to bottom then click calculate - it tells you:

MR2 (mkii) Flushness:
Your proposed front wheel will be 35.05 mm tucked in from flush (flush offset: 9.95).
Your proposed rear wheel will be 35.05 mm tucked in from flush (flush offset: 9.95).

I assume that's where you get the 10mm (9.95) from but dont forget standard wheels already have their own offset of 45 so if you want to get to 10mm you add the spacer of 35 ie. +45mm et - spacer of 35mm gives +10mm et which is flush! Confused yet?!!!!

*** IMPORTANT **** Don't just go looking for wheels with an offset of 10 as the correct offset changes dependant on the width of the wheel - the offset is really how far away the mating surface on the wheel is away from being in the middle of the wheel.

To illustrate lets say the offset on the wheel is zero (just to keep things simple) so the mating surface of wheel to your hub on the car is absolutely in the middle of of your wheel. If its a 7" wheel then the wheel will stick out 3-1/2" from your hub but if you had a 10" wheel again with an offset of zero then your wheel would stick out half that which is 5" so the 10" wheel sticks out 1-1/2 inches more than a comparable 7" wheel. Thats actually why you have offsets - you can put a wider wheel on and either add a spacer to negate the offset which will make the outside face of the wheel be flush with side of car or a negatve offset which will give you a dished wheel.

Hope this makes sense - its just oneof those things that just clicks all of a sudden!

Have a read of this - explains it much better than I ever will! LOL

http://www.carbibles.com/tyre_bible_pg4.html

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Re: wheel sizes

Post  jack on Fri Jul 08, 2011 4:10 pm

thanks, i think i get the jist of it now Very Happy very useful info!

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Re: wheel sizes

Post  Admin on Fri Jul 08, 2011 10:14 pm

your welcome :-)

if anyone wants sizes/combos of wheel/tyres checking just post them up here and they can be checked

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ET

Post  jack on Fri Sep 23, 2011 4:04 am

Okay another question now. How do you measure the ET of a wheel?! I've found some wheels I'm interested in but the seller doesn't know the ET for sure and says that its not stamped anywhere Rolling Eyes

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Re: wheel sizes

Post  Admin on Fri Sep 23, 2011 4:11 am

It must be stamped somewhere - you just have to look!!! Sometimes its tucked away in one of the crevices and can be barely visible but it will be there.

The only other way - and it really is a bit rough and ready so should not be relied upon if its a close run thing - is to put a block of wood across the outer rim of the inside of the wheel then holding a ruler at a right angle to the hub mating face measure the distance then divide the width of the wheel by 2 eg if its an 8" wheel then the 0 offset would be 4" or halfway through the wheel which should be 4 * 25.4 = 101.6mm. Using this as an example if you then measured as per above and got 121.6mm then you would have a +20 offset.

As I said if its a case of buying a spacer if its wrong go for it but if it means the wheel wont fit then AVOID!!!! LOL

BTW If its for your TRD you could always by my work equips ;-')

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Re: wheel sizes

Post  Stevie on Fri Sep 23, 2011 5:35 am

What Works you sell now Jeff? The proper fitting ones? Cool
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Re: wheel sizes

Post  Admin on Fri Sep 23, 2011 5:49 am

These which I bought especially in a TRD size

http://trd2000gt.forumotion.com/t120-fs-set-of-4-x-17-restored-work-equips-for-a-trd-rear-1100

Will do em cheap since its you :-)

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Re: wheel sizes

Post  Stevie on Fri Sep 23, 2011 6:57 am

I'll see how much my holiday costs when I get back from my 'overseas' trip lol, then I need to book it in for mapping. My wallet = Sad Sad Sad
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Re: wheel sizes

Post  jack on Fri Sep 23, 2011 8:29 am

well you'd think it would be stamped somewhere but apparently not. they've been repainted though so they've probably covered up the markings annoyingly. he's got a friend with an mr2 and has offered to try them on that and measure how far out the arch they sit, so i should be able to work out if they'll fit from that. then IF i buy them i can measure them properly Very Happy thanks for the information, very useful as usual!!
and thanks for the offer but i'll let stevie take dibs on those pirat

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Re: wheel sizes

Post  Admin on Fri Sep 23, 2011 10:45 am

let us know how you get on and if you buy them post some pics up :-)

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Re: wheel sizes

Post  jack on Fri Sep 23, 2011 3:43 pm

will do and will do... IF i get them

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Re: wheel sizes

Post  jack on Thu Oct 06, 2011 1:35 pm

Just paid for the wheels and can't wait for them to arrive! i couldnt get the seller to take measurements for me but he's sent some pics of them on a standard mr2 and they look about right... well fingers crossed anyway! i'll be sure to share some pics and a reveal of which wheels i've gone for once they arrive Very Happy

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Re: wheel sizes

Post  Admin on Thu Oct 06, 2011 1:40 pm

Yay! Get the pics up as soon as there on the car :-)

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Re: wheel sizes

Post  Infamous on Thu Oct 06, 2011 5:47 pm

Nice, looking forward to pics Smile

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Re: wheel sizes

Post  jack on Tue Oct 11, 2011 9:04 am

update on my build thread Smile

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