New rims/tires for the track

[qws2000]

Ok I did get Race stars Black rims and they are 15x10 5x4.75 bolt pattern b/s 7.25.... I only got 2 rims as they are going on the cars that go to the track. My questions are is that too much backspace, and Is there a big difference between 15x10 and 15x8. I am putting on 275/60/ D/R on the rims..

 

[Phoneguy]

I dont think those will work even with a frame notch...Try bolting them on and see.

Bryan

 

[pacecarta]

should have done your homework first ,maybe for a vette
but on a turbo regal even with a frame notch youll need over 2.5" of spacer

 

[Pronto]

Hope you can return them.

 

[qws2000]

I would have not purchased it with the 7.25 b/s.... But funny thing rim does fit... I have 17x10 on the back now with 295/50/17s and no frame work or rolling... I was more worried they wouldn't be able to handle the abuse at the track... Good news they can go back, and since my wife bought them as a gift, she tried her best... I love the style of the rim, so I am getting 15x10 5x4.75 lug and 5 B/S

 

[SCOOBY DOO]

You'll likely need shim(s) to get the 275/60/15's off the frame rails with the 5" backspace.

 

[texasterror]

You'll likely need shim(s) to get the 275/60/15's off the frame rails with the 5" backspace.

Hope I don't sound stupid but when you state shim does this mean adding space between the wheel/hub and frame rails? Is this something like a washer of sort but for wheels?

 

[TURBOPOWERED68]

Hope I don't sound stupid but when you state shim does this mean adding space between the wheel/hub and frame rails? Is this something like a washer of sort but for wheels?

probably means thin spacer, i have seen 1/4 inch spacers crack i'd imagine that a 1/8 would also crack maybe easier and faster.

 

[pacecarta]

spacers cracking?? must be a NY thing

 

[pacecarta]

if you need more spacer than is safe for your lug studs either get longer studs or you can run adapters
if you need spacers , first rule is dont stack them , if it needs more than one measure the total and find that size in a single spacer. i've run 1" spacers (actually adapters with the bolts knocked out using tall lug studs in the axles) with low 1.4 launches off the brake . NHRA allows them but only one, stacking is against the rules
the pepboy spacers are junk cast .. not solid or lug / hub centeric , ebay has solid spacers that are drilled for your bolt pattern or hub centric ,when it comes to adapters you want dual hub centric and on aftermarket that have a larger hub it may require a ring to center the wheel

GM used thin spacers on the late 80's camaros

 

[qws2000]

PLEASE Someone Give Me Info..... I have 17x10 on Rear tires 295/45/17... I have these new race star 15x10 and putting Hoosier D/R 275/60/15.... Is there a big difference in the two Tires at the track.... I mean this is going to run about 1500 extra for the entire package???? Please what will I gain???

 

[20psiofevil]

Not sure I'm getting your question correct but here's a shot.

Making around 400 rwhp, Steel bullit style 17x9" 275/40/17 555r's vs stock aluminum 16x7.5" 255/50/16 555r's was good for .3 in the 8th. The weight difference was 65lbs total iirc on all 4 rims.

 

[Phoneguy]

PLEASE Someone Give Me Info..... I have 17x10 on Rear tires 295/45/17... I have these new race star 15x10 and putting Hoosier D/R 275/60/15.... Is there a big difference in the two Tires at the track.... I mean this is going to run about 1500 extra for the entire package???? Please what will I gain???

That is going to depend on how much power your car makes. What are your current 60' times ? Does your car spin at the line now ? You will be able to hit the tires harder with the 275/60/15 due to the sidewall being taller.
If your car doesn't have the power to spin the current tires then you will gain nothing.

Bryan

 

[Pronto]

Take a look at Bryan's picture. See how the rear tires are flattened out and the sidewall narrowed? Can't do that as well with a 50, 45, 40 or 35 series sidewall. Some can hook with thinner sidewalls but I haven't seen many. That squish is what makes the tires grab for a good 60'. For the track, you could just find 2 inexpensive aluminum 15x8 rims and mount the 275/60/15 dr's on them. No need to drop $1500 on a set of rear track tires/rims for a few days at the track.

 

[texasterror]

Take a look at Bryan's picture. See how the rear tires are flattened out and the sidewall narrowed? Can't do that as well with a 50, 45, 40 or 35 series sidewall. Some can hook with thinner sidewalls but I haven't seen many. That squish is what makes the tires grab for a good 60'. For the track, you could just find 2 inexpensive aluminum 15x8 rims and mount the 275/60/15 dr's on them. No need to drop $1500 on a set of rear track tires/rims for a few days at the track.

What he said. I just picked up 2 weld drag lights for 200 dollars on craigslist yesterday.

 

[pacecarta]

skip the hosiers ...the MT 275 pro drag radial is it these days

 

[qws2000]

Paul, Thanks I was going that way more likely ... Thanks for the info guys, just so many people tell me I need to be at a 275/60/15.... I have 295/45/17 and get no traction, really very little, but I just didn't think there was that big of a difference....