Sprint race tyre choice

[dsl2]

Any opinions on the best 13in rubber for a 9in front & 10.5in rear rim size & suitable compounds for 20-30 mins races.

Also what sizes tyres are you running on those rims please?

I have heard talk that the Avon wet tyre is very poor compared to the Radical style Dunlop wet, any personal experience from someone who has used both at all?

[Josh Smith]

Avons in 210/550R13 and 275/570R13 in a11 or a24. a53 are good but for 20min races with a big power sports prototype, they may struggle at the end of a hot race.


Dunlop wets

[DarcySmith]

Colway remoulds!

That gives us mere mortals a chance to keep up


Darcy

[dsl2]

Most helpful, well one of you was!

Run the Dunlop wets as per the larger size ones we used on the PR6? Are those tyre sizes ok on the larger 9in & 10.5 in rims then?

[Josh Smith]

Yes, standard radical wets would do, see below from Dunlop site.....


190/535R13 suitable rim widths 7.5 - 9.5

230/570R13 suitable rim widths 9.5 - 10.5

Only problem with this is that switching from slicks to wets would make the front end lower due to tyre diameter.

Avon do 195/530 and 250/570 which would match up as a slick better for diameter.

Edited by Josh Smith on Sunday 25th November 08:47

[dsl2]

Great thanks Josh, I take it the Avon in those sizes are the F3 moulded wet that are poor then?

Ever tried a cut slick version of the Avon as a race wet?

[splitpin]

There's a pretty appreciable bit of difference diameter-wise between a 535 Dunlop and a 530 Avon, whereas their respective rears are close enough not to worry at all. Swopping between the two would have the effect of adding or subtracting something like 6mm of rake and that's a lot.

I'd be looking at hand cut Avons if I wanted to use their drys (with their greater choice of compounds).

[Josh Smith]

Don't think Avon moulded wets are in the right sizes for you. The f3 cup cars use 180 fronts and 250 rears.

Hand cut Avon slicks could well work.

Do the makers of the car you are looking at buying use tyres that can be found in sprint race style compounds?

[BioBa]

Some information here on page 2 and 3:
http://socalpeeps.yuku.com/topic/1414/Dunlop-tire-...
I was quite surprised that the many Americans run the BFGoodridge R1 and even Toyo R888s. For short sprint sessions and hill climbs the Toyo R888 GGG compound certainly would warm up a lot quicker than my Dunlop slicks.

[splitpin]

20-30 minutes is a hell of a long sprint?

[BioBa]

My sprint sessions are 5-6 minutes.

[dsl2]

Cheers guys, helpful.

[DarcySmith]

dsl2 said:

Cheers guys, helpful.

Anytime