1970 Nova wheel help [Archive] - Nova Tech

: 1970 Nova wheel help


MDrex
Nov 2nd, 08, 10:42 AM
Just picked up my '70 Nova and need to change the wheels in order to fit disc brakes. I'm looking for 17" wheels. 2QuickNovas makes it sound like I can fit 17x7 with 4.25" of backspacing on the front and 17x8 with 4.5" of backspacing on the rear without issues. Looks like 235/50-17 and 275/50-17 tire should fit the front and rear. I got these sizes by calculating the same width and diameter as the 275/60-15 and 235/60-15 tire sizes 2QuickNovas says fit and are very common.

Does anyone know if I'll run into issues with these sizes?

Big Dave
Nov 2nd, 08, 10:54 AM
Depends upon the calipers of the disc brakes you choose. PBR dual calipers are different from single puck OEM GM, which are different again from the billet builds of four or six piston floaters used by the aftermarket. It is like asking for a blank check.

Big Dave

MDrex
Nov 2nd, 08, 11:29 AM
My plan is just standard GM disc package, like the CPP one. My concern isn't if the brakes will fit under the tires. My main concern will be if the wheels/tires will fit under the car? I'm also planning on lowering the car about 2 inches.

Should I just go with 225 and 265 tires?

SHIFTY4
Nov 2nd, 08, 11:40 AM
i'd check the offset of the wheels that are on the car right now VS the width of the differential and confirm the differential is stock... i saw the pics posted in the other thread and the wheels stick out past the fenders pretty far... either the wrong offset or the differential's too wide.

any disc brake installation will move the wheel out due to rotor vs drum thickness so keep that in mind when you do the conversion/buy new wheels.

"Percy" makes a wheel measuring tool that might prove helpful... always best to measure before buying wheels to confirm what will fit.

here's a link to the tool: http://store.summitracing.com/partdetail.asp?autofilter=1&part=PHP%2D01201&N=700+115&autoview=sku

MDrex
Nov 2nd, 08, 07:16 PM
The wheels in the pic are not on the car anymore. Those pics are from the previous owner. I had him put smaller wheels on the rear so that the car could be lowered back down. He had airshocks to raise the rear up so that he could run those wide wheels.

I want to go the other way with the car. I want to lower about 2" below stock and run 17" wheels, plus do some simple suspension upgrades to aid handling and convert to disc brakes.

brian oneil
Nov 2nd, 08, 07:24 PM
yeah ditch those airshocks:thumbsup:

MDrex
Nov 5th, 08, 12:03 PM
Would a 15x8.5 with a 3.5" backspace wheel be too far off to fit in the wheel well of a 1970 Nova? Seems like maybe it would stick out too far.

The Big Al
Nov 5th, 08, 01:58 PM
Would a 15x8.5 with a 3.5" backspace wheel be too far off to fit in the wheel well of a 1970 Nova? Seems like maybe it would stick out too far.

NO! NOT EVEN CLOSE~!

15 X 8.5 will need 5 inch BS min!

Al

MDrex
Nov 5th, 08, 05:23 PM
NO! NOT EVEN CLOSE~!

15 X 8.5 will need 5 inch BS min!

Al


Thats exactly what I was expecting. But it never hurts to ask. Its too bad because I found a great deal on a nice set of ConvoPros.

Big Dave
Nov 5th, 08, 05:40 PM
My plan is just standard GM disc package, like the CPP one. My concern isn't if the brakes will fit under the tires. My main concern will be if the wheels/tires will fit under the car? I'm also planning on lowering the car about 2 inches.

Should I just go with 225 and 265 tires?

This tool should answer your questions about tire wheel combinations and back spacing.

http://store.summitracing.com/egnsearch.asp?N=700+400251+115+4294772430

But I would caution you that not every wheel on the market will bolt up to your axel flange and clear the caliper. To get caliper clearance will require using a spacer which affects your back spacing again.

Big Dave

MDrex
Nov 5th, 08, 10:15 PM
Anyone know how the 17" American Racing Torq Lite wheels fit over disc brakes? I'm NOT going to be a big brake kit, probably just 11" rotors.

justin72nova
Nov 7th, 08, 05:26 PM
10.5 - 11 inch rotors will fit a stock 14" wheel

Philip
Nov 7th, 08, 11:41 PM
10.5 - 11 inch rotors will fit a stock 14" wheel

x2 on that.

the 17's will allow more backspacing on the rear as they will clear the lower shock mount instead of interfering with it.

MDrex
Nov 8th, 08, 12:26 PM
x2 on that.

the 17's will allow more backspacing on the rear as they will clear the lower shock mount instead of interfering with it.


What kind of backspace are you saying is ok with that? 4.5" OK?

Philip
Nov 8th, 08, 10:42 PM
With a 15" wheel 5" is tight, 4.5" fits well, with the 17's sheetmetal and and the leaf spring are the limiting factor.

strtlegal
Nov 15th, 08, 02:29 AM
4.5 wont be enough in the rear...especially if you have not trimmed your wheel lips on the qtr panel...i ran a 17x8 w/4.75 on a 275/40r17 and it was close to where my stock sheetmetal used to be...

keep in mind most tire manufactures dont recommend a 275 on an 8" wide rim

MDrex
Nov 15th, 08, 10:39 AM
I'll probably go with a 255 on the rear. The rear wheel well lip is rolled, but I'm not sure how much extra space it provided.

MDrex
Nov 15th, 08, 11:27 PM
Anyone know if the Summit Racing Summit Star wheels are good or bad?

strtlegal
Nov 16th, 08, 07:47 PM
http://i25.photobucket.com/albums/c84/strtlegal/nova%20misc%20parts/100_1252.jpg

275's with 4.75" bsp