Breze84

Seasoned Drag Racers... I have a question! Im looking to go with a different rear tire for the track. I had a 305/35/18 Hoosier and a 305/35/18 MT, Both were 25"... I want to get a little more height without any problems.

I was looking at the 295/45/17 MT "I think its 27" and I was also looking into drag radial sizes 275/40/17 which seem to be 26" tall.

Im running front calipers in the rear with front Z51 rotors so 17" is the smallest i can go. The car is making 600/575 N/A with a RPM stage 6 4L65 A4 and a built C6Z 3.42 diff. Car has gone 10.50's @ 130 with 305/35/18 Hoosiers with a 1.5X 60' not using the trans brake. The car has more in it. What do you guys think?

Dave-T

Probably not what you want to hear but I would swap out the rear brakes and go with 16" wheels with 27" MT's.

http://forums.corvetteforum.com/drag...-28-tires.html

LS1LT1

Just an FYI, the 305-35-18s are generally (slightly) taller than the 275-40-17s. Roughly 26.4" versus 25.8" I believe.
The 295-45-17s are over 27" so that might be the one you're looking for.
Just be sure to mount it on at least a 9.5" (10.0" - 10.5" might be even better) wide rim.

Breze84

Yea 16's would be nice but I like the way the car stops now and I don't feel like doing the brakes over again... Also don't you need a different spindle? or is that 15's only?

I thought the 275/40/17's were taller then the 305/35/18's... I could swear that my 305's were 25 and some change... Anyways, If I went with the 295/45/17's will I have any inner wheel well rubbing issues?

LS1LT1

They're 'close', but the 305-35-18s are an even 26.40" tall (there is some slight variance among different manufacturers of course, a centimeter plus or minus etc.) and the 275-40-17s range between 25.70" and 25.90" or so. That is when 'new' of course, once they wear out they do lose some more overall diameter. A worn out 305 could be very close in height to a brand new 275.

Unless of course you really meant 315-30-18s, those are slightly shorter (as are the 315-35-17s as well).





You possibly could. Wheel width, offset and ride height are key factors there but generally they should clear the inner fender liners.

Breze84

I think I will look more into the 295/45/17... I have factory ride height on coilovers so its no big deal to raise if needed. Im just looking for a tire with more sidewall and something that could yield me some better pass times... mph and et...

Thanks bud

2003VETT

I have the same setup with brakes. The 295/45/17 mickeys are awesome. I've cut low 1.3's/9.3 on them. Great tire and they are 27".

Breze84

Now for my power level, Trans, Gear ect, Would It be a wise move over a 26" radial. Im just worried that with the 27" I will actually be slower then with a 26"...

LS1LT1

On a car like mine, that heavier, taller 295-45 would DEFINITELY slow me down over the 275-40s that I'm using.
But in a car that happens to need the added traction of that sidewall and width, the slight loss in gearing is not as detrimental.

2003VETT

I was overpowering the 275/40/17, and was racing a lot at etown. I did it more for consistency because the track wasn't doing prep very well. The tires straightened it right out. The larger tire helped out with the poor track prep. They proved to be a very consistent tire at all tracks...