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Hey guys, apparently coys wheels is not carrying the popular sizes for c3s any longer...
Will 18x8 4.5 inch backspace fit the front?
And will 18x9.5 5.5 backspace fit the rear?? Apparently these are the only sizes they have left...
Thanks!
The 18 x 8 should fit ok in front but the 18 x 9 with 5.5 inch backspacing would need at least the e-brake bracket relocated..and they would be very far inside..
I have since figured out they used the stock replacement 8" spring bolts. I am going out to jack it up and put the 18x 9.5's on and then the 18x8.5'x since there is only 3/4" bs difference they are making it seem like much more.
Not 18's, but I really like my 17's. 17x9.5, with a 255/50r17 tyre on all 4 corners. -5mm offset, basically 5" backspace. I can understand why people chose 18's, as I had to shorten the rear spring and move the handbrake cable mount to the top of the trailing arm. These would have fit inside the wheel on an 18 and not been a problem... I also had to reshape the rear sway bar slightly to avoid rubbing the tyre.
Last edited by Metalhead140; Aug 13, 2017 at 04:15 AM.
Coming.....mid-March.......to a corvette forum near you!
Michelin Pilot Super Sports - 245/45-18 fr and 275/40-18 rr on 18x8, 4.5 bs and 18x9.5, 5.25 bs U110 Rambler by US Mags.
That is my exact set up. Just waiting for the weather to break here in the great north to bring them out.
I am adding some custom jewelry to mine to make them a little different though.
From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
Those rear tires are hard to find here too. Local dealer called his dist'r and was told 6 weeks on back order. That seems to be Michelin's story anytime you can't find an available tire size. Anyway, went online and a tire dealer in Quebec located 5 in that size in Calgary, Alberta. Grabbed two of them. Should be here next week and the wheels.
Front
Global West upper and lower control arms
Gymkhana front coil springs
Bilstein sport shocks
Addco 1 1/4" sway bar
Borgeson gear box conversion
VBP spreader bar
18 x 8.5" Foose F117 Nitrous wheels
245/45ZR18 Nitto NT555 tires 26.57" dia
Rear
VBP 420 lb composite spring
8" spring links
Bilstein sport shocks
new stock trailing arms
Global West adj strut rods
18 x 8.5" Foose F117 Nitrous wheels
255/45ZR18 Nitto NT555 tires 26.97" dia
From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
Originally Posted by resdoggie
Coming.....mid-March.......to a corvette forum near you!
Michelin Pilot Super Sports - 245/45-18 fr and 275/40-18 rr on 18x8, 4.5 bs and 18x9.5, 5.25 bs U110 Rambler by US Mags.
Finally got tires mounted on rims. I used a 3/16" spacer on rears and relocated parking brake bracket. No interference. I have 8" spring bolts but the rear still sits too high. A 10" bolt will probably interfere with the tire. Live with it for now. I tried a 1-1/4" spacer on fronts but the tire just barely rubs the front fender lip. Without the spacers it fits fine but the wheels sit too far inboard for my liking. I will be lowering the front 2-3".
Hey guys, apparently coys wheels is not carrying the popular sizes for c3s any longer...
Will 18x8 4.5 inch backspace fit the front?
And will 18x9.5 5.5 backspace fit the rear?? Apparently these are the only sizes they have left...
Thanks!
Ive been building my 1980 for a couple years now and I have 17 & 18 Coys. My rears are the 18 x 9.5 with 5.5 BS.
Fresh stock trailing arms.
Im running Nitto 285-35-18 NT-05 rears.
VBP 360 Lb mono spring 1/2" shorter on each end with 8" bolts
I had to move the brake cable brackets to the top and route the cable behind the arms. Also running 1/4" billet spacers with ET lugs. Tires have 1/4" to 3/8" clearance to the arms and tires are right at or just under the fender lips.
28.5 " from floor to lip at the center line.
Top of the tire to fender lip is 3 "
Trailer arm to bump stop with this set up is 1 1/8 "
Im going to run this and see how I like it for the first combo.
Ive been building my 1980 for a couple years now and I have 17 & 18 Coys. My rears are the 18 x 9.5 with 5.5 BS.
Fresh stock trailing arms.
Im running Nitto 285-35-18 NT-05 rears.
VBP 360 Lb mono spring 1/2" shorter on each end with 8" bolts
I had to move the brake cable brackets to the top and route the cable behind the arms. Also running 1/4" billet spacers with ET lugs. Tires have 1/4" to 3/8" clearance to the arms and tires are right at or just under the fender lips.
28.5 " from floor to lip at the center line.
Top of the tire to fender lip is 3 "
Trailer arm to bump stop with this set up is 1 1/8 "
Im going to run this and see how I like it for the first combo.
My hood was allot of work, molded a L88 scoop onto my original 80 hood. I wanted to keep the front stock shape and lines. Also glassed in and got rid of all the seems on the nose and rear end.
