Page 1 of 1
Wheel and Tyre sizes
Posted:
Fri Apr 18, 2008 5:45 pm
by gav
Hi all
If there were no rules on wheel and tyre sizes - what would the optimum set up be for hills and sprints?
The car I have is an ex racer and is currently set up with 11" rears, 10" fronts, a full splitter and large rear wing.
I have the sense that 8" and 10" might be more agile for hills and sprints but would be grateful to hear constructive opinions.
Thanks
Gavin
Re: Wheel and Tyre sizes
Posted:
Fri Apr 18, 2008 8:14 pm
by Midlife
I use 7x21x13 crossply slick all round for hills/sprints. Its a plus 2 with approx 50/50 weight distribution, and I find it just right. Suspect that as I get more horses added I will need 8" on the rear.
Another plus 2 that I have seen pushing 203hp has 9" on the rear and 8.2" on the front, at least it was the last time I looked.
Doug
Wheel and Tyre sizes
Posted:
Fri Apr 18, 2008 8:33 pm
by gav
Doug
Thanks for that
I should have mentioned that it is an S3 so I dont have the luxury of the plus two wider track and extra length. (although I do have rather large arches to fill)
I will be pushing around 220 horses through a 2L small valve cosie BDA
You raise a good point about whether they should be roughly the same size all round or whether there should be a marked difference between the front and rears.
Regards
Gavin
Re: Wheel and Tyre sizes
Posted:
Mon May 05, 2008 7:49 pm
by Midlife
Thought I would try and get this thread going a bit...?
What about wet track day tyres? has anyone got any thoughts on good wet radials? for water displacement... I have found this website comparing tyres but there is not allot for 13"
http://www.tyrereviews.co.uk/
Anyone use a Yokohama A539 Tyres 175/50/13 ?
Doug
Re: Wheel and Tyre sizes
Posted:
Sun May 25, 2008 11:26 am
by paros
Hi
With my old race Elan, I used 13" wheels with 9/20X13 front and 10/20X13 rear - sometimes 9.2/22X13 for a higher top speed at places like Mallory. these were on 10" wide fronts and 12" wide rears.
This was using a genuine 285bhp and something like 220 ft lbs of torque - not a 2000E box or Lotus diff of course for the transmission. Also a modified Spider chassis and about 1350 weight of car.
As to 1b wets, I am told that the 185/50X13 Avon CR28 is the tyre to use, the AO48R is nasty in the wet with no warning before it goes, although the compound is excellent for the wet.
Richard