Wheel Specs and arch modding

ukeuropolo · Post by **ukeuropolo** » Tue Oct 05, 2004 4:30 pm

i think of ordering my rims soon. 7x14 (front) 8x14 (rear) et 25, what does the ET 25 stand for and how does this effect the wheel? do u lot think i'll be able to fit these rims without arch modds? and also how low i was tinkin 80-90mm?

bstardchild · Post by **bstardchild** » Tue Oct 05, 2004 4:45 pm

ukeuropolo wrote:i think of ordering my rims soon. 7x14 (front) 8x14 (rear) et 25, what does the ET 25 stand for and how does this effect the wheel? do u lot think i'll be able to fit these rims without arch modds? and also how low i was tinkin 80-90mm?

ET is the distance in mm from the centre line of the rim to the hub mounting face

so the higher the ET the further in the wheels will appear if you keep the same rim width - obviously if you increase the rim width the effect will be reduced but you run the risk of fouling the strut.....

The lower the ET the further out the wheels will stick out if you keep the same rim width - obviously if you increase the rim width the effect will be even greater but you run the risk of falling foul with the boys in blue.....

I've a web site link somewhere that helps you compare all the wheel dimensions and specifies the clearance reductions v std wheel - this way you can measure up your std clearances and then know what you have to play with...... its a bit rough and ready but it works for me

Lowering just makes it all worse - 70-80mm is slammed

Rough and ready one - I had on this PC but it's better than nothing

http://toy4two.home.mindspring.com/offset.html

For Tyre sizing and profile changes when you go up on wheel size

http://www.mr2.com/FORMS/tire.html

When you know what your clearances are

http://members.aol.com/agspeed/tiresize.htm

Can't find the best link yet - the one that does it all

Its on my home PC Somewhere

LJ_87 · Post by **LJ_87** » Tue Oct 05, 2004 4:57 pm

just curious, what is the pcd and offset for a mk4, im guessing pcd is 4x 100?

bstardchild · Post by **bstardchild** » Tue Oct 05, 2004 7:02 pm

LJ_87 wrote:just curious, what is the pcd and offset for a mk4, im guessing pcd is 4x 100?

ET 45 for a GTi with 6.5 by 15's

ET 43 for a 1.4 CL on steelies 5.5 by 13's (cooking version)

mk4ads · Post by **mk4ads** » Wed Oct 06, 2004 7:41 am

And theres me thinking ET35 was the safest ET to go for on a mk4?

I have 7"x15" and they are ET24, feel the arches quite nicely. Im lowered about 120mm but ofcourse thats with flared arches but before that i could lower it about 80mm tops before it scrubed and that was with rolled arches.

I think with that ET you will struggle to go 80-90mm without any arch mods

david burton · Post by **david burton** » Wed Oct 06, 2004 12:38 pm

I agree - I'm on ET35 with 7x15's too. I have a bf goodrich tyre on the back and it rubs (I'm lowered 80mm), so that tyre is slightly wider than the rest - it's going to be moved to the front!

bstardchild · Post by **bstardchild** » Thu Oct 07, 2004 12:52 am

ukeuropolo wrote:what does the ET 25 stand for and how does this effect the wheel?

Specific answer to specific question - Speedlaw's info

http://www.tigerstyle.co.uk/poloforum/v ... php?t=1967

Proving once again of teh value of a good trawl thro old posts!!!!

bstardchild · Post by **bstardchild** » Thu Oct 07, 2004 10:21 am

Update

Finally found it - best web link I've found for comparing wheels tyres ET's and gives the resultant effect on speedo accuracy and gearing if you complete all the details

http://gs.tolan-hoechst.com/tirecalc.htm

Worth bookmarking IMHO - I did just couldn't find it!!!

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Wheel Specs and arch modding

Wheel Specs and arch modding

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