15" wheels for FD drag racing, do they fit?
 

I don't have excel so I can't access Jimlab's wheel fitment guide.. I was wondering if 15" wheels clear the brakes on FD's, and if so what backspacing/wheel sizing are people using. Thanks-Nick

Try posting in the drag racing section.

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They will fit in the rear with slight caliper grinding.

Yeah they will fit I believe there is a thread on all the info you need about fitting 15" wheels on a FD. I am in the process of installing 15" WELD ProStars on my FD.

I found a thread with some conflicting info- one person was saying to use a 15x8 w/ 7.25 bs and a 1/4" spacer, one was saying 15x8 5.5 bs 1/2" spacer. I have a set of 15x10 7.5 bs Draglites for my Supra, along w/ a set of 15x10 6.5 bs Centerline Convo pros, when it warms up and I actually start working on my car I'll have to check it out. I was just looking for a quick definitive answer and couldn't find one. I'm surprised its not a sticky in the drag racing section.

I have 15X8" in the rear with 5.5 BS and Ari Yallon told me with some slight grinding of the caliper they will fit fine without spacers. But you have to remember you will need 3" studs and lug nuts to install.

GL

Little work on the front caliper and they will fit.
Attachment 704777

man that thing looks beefy. You should of put the rear wheels as well

I might tomorrow morning, just depends how early I get up!

post up the pics,
What wheels are those? I am pretty sure you have the 3" studs

Nice!!! Are those http://store.summitracing.com/partde...5&autoview=sku ?

10" wide and 6.5" backspace?

What kind of work on the calipers? Grinding here and there? What about the rear?

I have been desperately researching if I could fit 15" rims and mount 275/40/15 Hoosiers A6 for my autox car...

Thanks!

- Sandro

Weld 15x8 Pro Star with 5.5" backspacing 5x4.5 lug pattern
You'll need to grind down the brake caliper, but thats it.

Thanks Ernie.

Would they still fit OK with a 6.5" backspace front and rear? (I need 10" wide rims)

- Sandro

I´ve tried with 10" wide pro stars in the rear. Don´t think it will clear the toe link no matter what backspacing you go with.. A 10" wide wheel will need to be at least 16" high to clear the toe link.

Thank you but why do you say that this has nothing to do with the backspace? E.g. a wheel with 0" backspace would not interfere for sure with the toe link. I understood from other posts that 15" can fit in the rear by grinding out the toe link nut. What I am trying to understand is what is the max backspace on such wheels required to clear the toe link.

- Sandro

The toe link is not the only problem trying to run 10'' the lower link will hit the out side of the rim.

Or you could grow a mullet jack the car up and run camaro style!:lol:

Sorry guys, bear with me but I feel retarded and don't understand what I am missing.

But, what does the 10" rim width have to do with the toe or the lower link clearances? I understand that wrong backspace or smaller diameter may cause interference with those but why do you keep pointing at the 10" width?

Provided that you have been able to mount a 15" in the rear with the appropriate backspace (and I understand from other posts that this can be done with some appropriate grinding of the caliper and the toe link nut) larger rim widths - but same backspace - will only cause the outside of the wheel to stick out more.

Thank you for your patience and understanding...

- Sandro

Not trying to give you shit, its just that ive tried a 10'' x 15 wheel with a 5.5 back space and it hits the edge of the wheel hard core.

But if someone has done it i wish they would speak up!:)

Well, if you say it doesn't fit, it won't and this is very valuable info. I was just trying to understand if it was a backspace or diameter problem.

This is what I found on the V8Rx7 forum

http://www.v8rx7forum.com/drag-racin...ag-wheels.html

If I understand it right, Dan Schechter's 15" used the rear with a 4.5" backspace + 1/2" spacer (needed to clear the protruding caliper? - I don't know). The post says 5.5rs and 4.5bc. I don't know what 5.5rs means and I assumed 4.5bc indicates the backspace. If this interpretation is right, it may mean that a no more than 4.5" backspace is needed to clear the links in the rear.

I guess we are getting there...

Thanks

- Sandro

Exactly i´ve tried 15x10 6,5 bs. if ypu space it out you clear toe link, but then the wheel will stick out about an inch . So if you have a wide body, no probz

Update.

I bought one 15" x 10" with 5.0" BS Pro wheel from Diamond http://www.diamondracingwheels.com/ProSeries.htm and "tried it on"

I found small interferences with the brake calipers F and R. In the R, there was also interference with the toe link bracket.

With a grinder, I easily took care the toe link bracket interference just by rounding up the top corner a bit.

I then found out I needed 0.5" spacer to clear the brake calipers and not touch the dropwell - see http://www.diamondracingwheels.com/Terms-BS.htm

In order for the calipers to fit them inside the dropwell area, I figured you would need to grind out the rdges in the R caliper by 2-3 mm. If you do that, you should be able to use 6.5" or maybe even 7.0" backspace. With my test %" BS wheel, there were about 2" between the toe link bracket and the start of the dropwell.

In the F, the caliper would instead require some grinding mainly at the top corner to fit the inside of the dropwell. There are no other parts of the suspension that would then limit your backspace other than the springs.

I personally don't feel comfortable grinding the calipers, although I would love to hear from people who may have done so.

In the end, I ordered 4 wheels with a 4.5" BS. Those will stick out quite a bit, but that is OK for my intended use.

- Sandro

Second update.

I canceled the order. I realized with a 4.5 bs in the front, the tire would interfere with the inside of the fender when the wheel is turned. So, short of grinding the caliper - which I don't dare doing - a wide 15" would not fit the front.

- Sandro

If the front clearance was the final issue then just run the rears 15" and run the front 16". it would look ridiculous but you'll get the gearing your need.

Ok so tell me what wheels I need to run 15" WELD PROSTARS all around. I want the skinnys in the front and I guess 15x8 in the rear. I know I need 5.5" BS in the rear with a 5x4.5 lug pattern. What about the fronts? Thanks guys.

PS: I already have extended NHRA legal ARP studs in the rear. Do I need them for the fronts too? I also have the stock brakes all around so all I have to do is slightly grind down the calipers?