[redlightrookie]

Hey guys , got a 70 chevelle n have 17x7frt n 17x8 rr with 235/40 , 275/40 . I want to put the 17x8,275/40s up front because the front sits to low with the 235s , 24" tall to 26" . I would like to get the 315/35s under the back n by my mesurements I should be around 6 1/4 to 6 1/2 bs . dose any body run this combo with that back space ? If you do can u post pics also the wheels I have are ar tq IIs n plan on staying with that brand . I know u are the guys to ask thanks for the help...rob

 

[Gokou]

If you want to run the 275/40 & 315/35 combo you are going to have to buy 4 new wheels.

The minimum wheel width for a 275/40 is 9" so those 8" wheels will not work. 275/40 tires will physically fit on an 8" wheel but it will not be within the manufacturer's specs for sidewall strength & safety.

If you want to stick with TT2's then 9.5" up front and 11" out back is what you want.

Depending on your suspension & brake combo you'll probably end up with 5.25-5.5" backspace on the front wheels and about 6.25" on the back wheels. 275/40 and 315/35 is pretty much at the limits for 68-72 wheelwells so you're going to have to measure your car to figure out what exact backspacing is required.

You might have to trim/roll the rear quarter lips and if your car is very low expect to get some rub up front at the top of tire near the outside edge unless you modify the inner fender wells for more vertical clearance near the outside edge.

 

[bri2203]

well said Troy

 

[redlightrookie]

Thanks gokou ! Good point on the 17x8 , the 275/40s where really tought to get on there . The car has hochkis springs n factory size brakes ,but cross drilled n vented with the same size dics on the back . Only one way to find out if thell rub n i'll order up the wheels n tires to find out ..lol. Still dose any body have pics of this comb on there 68 to72 ? Love to see what I'm getting into .

 

[F1 Speed]

If you want to run the 275/40 & 315/35 combo you are going to have to buy 4 new wheels.

The minimum wheel width for a 275/40 is 9" so those 8" wheels will not work. 275/40 tires will physically fit on an 8" wheel but it will not be within the manufacturer's specs for sidewall strength & safety.

If you want to stick with TT2's then 9.5" up front and 11" out back is what you want.

Depending on your suspension & brake combo you'll probably end up with 5.25-5.5" backspace on the front wheels and about 6.25" on the back wheels. 275/40 and 315/35 is pretty much at the limits for 68-72 wheelwells so you're going to have to measure your car to figure out what exact backspacing is required.

You might have to trim/roll the rear quarter lips and if your car is very low expect to get some rub up front at the top of tire near the outside edge unless you modify the inner fender wells for more vertical clearance near the outside edge.

:yes: Yup, Troy is right on the money. I will add that I gained a little more clearance in the front running 275/40/18's on a 9.5 wheel by swiching to plastic inner fenders. Also a tight rear suspension with tubular arms in the rear made a world of difference for me. Stock control arms with fresh bushings wasn't enough for me a few years ago.

 

[Thorens1]

Good info...I'll be calling on you Troy when it comes time for me to set up my rims and wheels.

 

[Gokou]

I'm currently in the middle of slicing-and-dicing a set of steel inner fenders for the extra clearance needed when you're "low and wide"-- I'll post pictures in a few days. The offending areas of the fenders are cut out and the patch panels are cut. Yesterday I tossed the patch panels in the press brake to form the needed 80 degree angle at the top. I test fit them last night and they fit nearly perfectly-- just as good as the posterboard flat patterns I came up with. Next is a little bit of fine trimming of the new metal in the corners then I can weld them in.

I've also "rolled" the lips on the front fenders up into a more vertical position for a little more room as I really want to get a pair of 18x10s on the front of this thing and have them clear everything at full lock. I'm 90% sure I can pull off 18x10s with 265/35 after the inner fender mods. (I also think I can manage a 315/30/18 out back on an 11.25 or 11.5 wheel, but that's another matter entirely.)

If other guys are interested I have the flat patterns needed to make the patches-- I could easily digitize them and include scale marks so you could print the flat pattern out on a plotter and cut the steel with a body saw... or better yet have them laser or waterjet cut directly in steel.

The "extra clearance" looks very similar to the pics in this post here:

http://www.lateral-g.net/forums/showpost.php4?p=220538&postcount=18

 

[93Polo]

265s on an 18x10, you will be stretching the sidewall out on that tire. It should be very responsive. I ran 265/35s Yoko AVS Sports on 18x9.5s on my C4 and the sidewall was stretched a little.

Before you buy 17x11s I would look at tire choices as they are drying up in the 315/35 17. I would be looking at jumping up to 18s with 275/35 18s on 18x9.5s up front and 295/35 or 315/30s out back on 18x10.5 to 18x11s.

I went from 17x9.5/17x11 on my C4 with 275/40s and 315/35 to 18x9.5/18x11s with 265/35s & 295/35s. The inline grip did not change much but lateral did go up on the 18s.

 

[CHELKAMINO]

18x9.5 rears with 275/40
18x8 fronts with 245/40
no problems

 

[Gokou]

265s on an 18x10, you will be stretching the sidewall out on that tire. It should be very responsive. I ran 265/35s Yoko AVS Sports on 18x9.5s on my C4 and the sidewall was stretched a little.

Before you buy 17x11s I would look at tire choices as they are drying up in the 315/35 17. I would be looking at jumping up to 18s with 275/35 18s on 18x9.5s up front and 295/35 or 315/30s out back on 18x10.5 to 18x11s.

I went from 17x9.5/17x11 on my C4 with 275/40s and 315/35 to 18x9.5/18x11s with 265/35s & 295/35s. The inline grip did not change much but lateral did go up on the 18s.

Good point on tire sizes drying up. 17" sizes seem to be taking the path that 16" tires took about 6 years ago... there are now fewer 17" sizes being made compared to just a few years ago. There are many more sizes available in 18"-- and many that are very useful for our cars in terms of width & diameter. A few years ago I had no problems getting 255/45 front tires... now I can hardly find any and will have to move to 255/40 or 275/40.

As far as my front wheel/tire plans... 265/35/18 is rated for a 9-10.5" wheel so that's OK on a 10" wheel.

I currently run 255/45/17 on 9.5s up front and 285/40 on 11s out back; both are right at the max wheel width allowed for the respective sizes. I find that tires put on the max wheel width allowable means much more laterally "stiffer" sidewalls which on our relatively heavy cars really helps turn in response. If/when I move up to 18 I want to spec the wheel & tire combo so the wheels used are at or right near the max width allowed for the tire sizes.

 

[93Polo]

No doubt the 265 will be fine on the 10" wheel and will also handle great. I fully agree with your logic.

My main point is that it will likely have a Euro stretched tire look which guys on the import forums may love but it does not go over as well here. The 265/35s I had were Yoko AVS Sports on 9.5" (measure inside of the lip to inside of the lip) Forgelines and the tires looked stretched. The 265/18 has less sidewall than the 255/17 which exaggerates the look.

I'd jump up to the 275/35 18 the additional size (width and sidewall height) is more noticeable than the 10mm jump would indicate and they would still be plenty responsive on the 10. Plenty of S2000 guys run 265s on 18x9s and the sidewall is vertical and 275/35 is factory on C6Zs on 9.5s. Vipers run 18x10 with a 275/35 on the front and the sidewall is slightly stretched. Your car may pull off the 265 on a 10 due to the lower stance than most A-bodies can get (for the original poster Gokou has modified the trans tunnel)

The original poster may also want to look AndrewB70's build topic. He has some taller 18s (295/40s?) on the rear and the stance looks great in person.

 

[Gokou]

Right now with my 255/45 on 9.5 and 285/40 on 11 combo the sidewalls and tread are completely vertical from the rim lips. There isn't any sidewall bulge whatsoever but the tires don't look stretched as the "hellaflush" guys like to do... LOL

Personally, I like the way it looks now and I really like how quick the steering response is when changing direction.

Either way, final wheel/tire combo with 18s isn't too important right now as I probably won't be changing wheels for another year at the earliest. I still need to finish the car and drive/debug it this summer and then this winter do the watts link & ricks/vaporworx tank & fuel pump setup.

 

[Smity]

I run 18x9.5/18x11 with 265/35/18-315/35/18 tire combo. Car is lowered 2", rear fender lip is rolled, no rubbing at all.

 

[eddie1965]

Your Chevelle looks very cool. What are your wheel offsets?

 

[Boilermaker128]

Yup I agree, nice ride. Some more wheel details PLEASE. Looking for a new set right now.

Rubber?
Back space?
Make of wheels?
Whereda get em?

Thanks!

 

[BigBlock1969]

I run 18x9.5/18x11 with 265/35/18-315/35/18 tire combo. Car is lowered 2", rear fender lip is rolled, no rubbing at all.

Did you have any issue with the rear wheel well trim fitting where you rolled it??