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New alloys - size advice


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Redlevel

Club Member

Tue 12 Jun 18 09:14

Re: New alloys - size advice


Sid.123 wrote (View Post):Was looking at tyres for my c4..northants tyres are one of the only supplyers of this size and list the 255/50x16 for about 160 a pop.. On ebay they sell them for just over 200 each but i imagine that includes delivery...looking at smaller sizes like 225/55x16 you can pick them up for as little as 50 from any tyre supplier...its nice to have 255 but i think the 225's are calling

I constantly scope ebay for new 16" tyres that I can store for my '87. I already have a pair of Cooper 295/50x16's at 60 each, a pair of Nexen 245/50x16's and just picked up a pair of XP2000 275/55x16 for 150.

Problem with the early C4 is that it can look a bit ungainly at the rear with narrow tyres, that's why I like oversize tyres on the back. The 295's don't rub or stick out and fit perfectly on a 9.5"rim. From the back, my '87 looks almost like a red Mantaray beach buggy, almost cartoon like, which is how I like it.

New 16" tyres can be had, it just takes a lot of looking. I don't bother with Northants, as they are extortionately priced.

Mine on its 295's on the rear..

Image
Image



Last edited by Redlevel on Tue 12 Jun 18 09:23; edited 2 times in total. [16 %]

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Redlevel

Club Member

Tue 12 Jun 18 09:17

Re: New alloys - size advice


ta-daa!! Smile

https://www.ebay.co.uk/itm/2x-SUMMER-TYRE-Nankang-Utility-SP...

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CaptainK

Club Member

Tue 12 Jun 18 09:51

Re: New alloys - size advice


Thanks everyone for your comments so far - it is very much appreciated in helping me make up my mind. I think I'm still more swayed to the 17 inch at the moment.

roscobbc wrote (View Post):The point I am going to make is the following. Our cars were designed 50 years ago. Back then the stock sized tyre were considered 'state of the art' in relative terms. 50 year later tyre technology has improved significantly. The tyre width on our Vettes is regularly seen on everyday shoeboxes. Our tyres are old technology. No European brands even list them any more. All of the American tyres available (except one or two) are 'S' speed rated - a mere 113 mph (or not at all) and Corvette are supposed to be performance cars. Make no mistake - if you use large diameter wheels with low profile tyres the low speed ride will suffer - you'll get a lot of tyre noise. Once over 40-50 mph and you won't notice. With more 'grippy' rubber on the road your braking distances will reduce. The cars handling and cornering will also significantly improve
Thanks for these details, that was what I was thinking about with better UK tyre availability. Maybe not quite so fussed about speed rating, but I'm definitely interested in wet weather performance etc. I do want a nice "confident" tyre, despite me not going to drive it fast or do hard cornering etc - but I know good tyres do reduce braking distance, which is what I am interested in. (No, I'm not a tailgater or such, just appreciate good tyres for braking).

I have done alloy size increases with other cars in the past and can appreciate the difference in the ride the smaller profile tyres make. It doesn't bother me. I have to ask - will we actually hear tyre noise over the sound of our V8s? My 68 has side pipes and I can't hear a thing when driving other than them (which is what I like Very Happy )

Mostly the change to alloys is for cosmetic purposes, but if I can get good quality UK tyres and better braking etc, then that's even better. Very Happy

Thanks again all - keep the pictures coming Smile



Last edited by CaptainK on Tue 12 Jun 18 13:05; edited 1 time in total. [1 %]

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Redlevel

Club Member

Tue 12 Jun 18 11:24

Re: New alloys - size advice


Close up (old pic and pre paint) of one of my 295 BFG's (using Coopers now, just as good)..

Image



Last edited by Redlevel on Tue 12 Jun 18 11:26; edited 1 time in total. [16 %]

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roscobbc

Committee Member

Tue 12 Jun 18 13:31

Re: New alloys - size advice


CaptainK wrote (View Post):Thanks everyone for your comments so far - it is very much appreciated in helping me make up my mind. I think I'm still more swayed to the 17 inch at the moment.

roscobbc wrote (View Post):The point I am going to make is the following. Our cars were designed 50 years ago. Back then the stock sized tyre were considered 'state of the art' in relative terms. 50 year later tyre technology has improved significantly. The tyre width on our Vettes is regularly seen on everyday shoeboxes. Our tyres are old technology. No European brands even list them any more. All of the American tyres available (except one or two) are 'S' speed rated - a mere 113 mph (or not at all) and Corvette are supposed to be performance cars. Make no mistake - if you use large diameter wheels with low profile tyres the low speed ride will suffer - you'll get a lot of tyre noise. Once over 40-50 mph and you won't notice. With more 'grippy' rubber on the road your braking distances will reduce. The cars handling and cornering will also significantly improve
Thanks for these details, that was what I was thinking about with better UK tyre availability. Maybe not quite so fussed about speed rating, but I'm definitely interested in wet weather performance etc. I do want a nice "confident" tyre, despite me not going to drive it fast or do hard cornering etc - but I know good tyres do reduce braking distance, which is what I am interested in. (No, I'm not a tailgater or such, just appreciate good tyres for braking).

I have done alloy size increases with other cars in the past and can appreciate the difference in the ride the smaller profile tyres make. It doesn't bother me. I have to ask - will we actually hear tyre noise over the sound of our V8s? My 68 has side pipes and I can't hear a thing when driving other than them (which is what I like Very Happy )

Mostly the change to alloys is for cosmetic purposes, but if I can get good quality UK tyres and better braking etc, then that's even better. Very Happy

Thanks again all - keep the pictures coming Smile


Don't hear the tyre noise over the exhaust sound - Tyres are Toyo's, so not UK made (few are) wet weather traction is good - probably need to be careful of aquaplaning - grip is superb. You'll see on my signature the power my engine is making - unless the road is greasy or damp these handle the power very well.


--------------------
CCCUK Chairman
'68 coupe - 4 speed - 3.08 - 489 cu in - 570 bhp @ 5850 rpm - 606 ft/lbs torque (821 Newton Metres) @ 3850 rpm
Image

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Sid.123

Club Member

Tue 12 Jun 18 14:53

Re: New alloys - size advice


Food for thought...
Hadnt realy thought about goung wider but as you say..keep an eye out for 2nd hand bargains...good stuff


--------------------
59/69 silver beige/medium brown. 1 of 1,014 in 1986. C4 glasstop

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CaptainK

Club Member

Mon 06 Aug 18 10:34


Just a quick bit of thread resurrection to ask a small question:

Standard 1968 C3 wheels at 15x7 in size. Would there be any problems with putting 8 inch wide rims on a 1968 model? (e.g. 15x8 or 17x8 etc). I know from 1969 onwards they were fitted with 15x8 as standard, but not sure if I'd encounter any problems with putting 8 inch rims on a 1968 model.

Thanks Smile

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roscobbc

Committee Member

Mon 06 Aug 18 10:49


CaptainK wrote (View Post):Just a quick bit of thread resurrection to ask a small question:

Standard 1968 C3 wheels at 15x7 in size. Would there be any problems with putting 8 inch wide rims on a 1968 model? (e.g. 15x8 or 17x8 etc). I know from 1969 onwards they were fitted with 15x8 as standard, but not sure if I'd encounter any problems with putting 8 inch rims on a 1968 model.

Thanks Smile

No issue with using '69 (and on) wheels to a '68. 17" and upwards you'll need to be a little 'careful' with tyre selection - low profile rubber even if same rolling diameter as stock sizes will have a 'squarer' profile - edges/corners of tyre may 'rub' on the front or rear of fenderwell openings or chassis rail when steering is on lock.....even late C3 optional 15" tyre sizes on early C3 can be problematic...



Last edited by roscobbc on Mon 06 Aug 18 10:50; edited 1 time in total. [4 %]
--------------------
CCCUK Chairman
'68 coupe - 4 speed - 3.08 - 489 cu in - 570 bhp @ 5850 rpm - 606 ft/lbs torque (821 Newton Metres) @ 3850 rpm
Image

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CaptainK

Club Member

Mon 06 Aug 18 14:07


roscobbc wrote (View Post):CaptainK wrote (View Post):Just a quick bit of thread resurrection to ask a small question:

Standard 1968 C3 wheels at 15x7 in size. Would there be any problems with putting 8 inch wide rims on a 1968 model? (e.g. 15x8 or 17x8 etc). I know from 1969 onwards they were fitted with 15x8 as standard, but not sure if I'd encounter any problems with putting 8 inch rims on a 1968 model.

Thanks Smile

No issue with using '69 (and on) wheels to a '68. 17" and upwards you'll need to be a little 'careful' with tyre selection - low profile rubber even if same rolling diameter as stock sizes will have a 'squarer' profile - edges/corners of tyre may 'rub' on the front or rear of fenderwell openings or chassis rail when steering is on lock.....even late C3 optional 15" tyre sizes on early C3 can be problematic...

Thanks, I thought you might be on the ball, being a fellow 1968 owner. Smile

I'm hoping to have 17x8 wheels on my '68 and had thought about rolling diameter, but not thought about the "squaring" of low profile tyres - thanks for the heads up. I'm hoping I'll be ok though, as IIRC 1968 C3s came with 205/70/15 tyres on them (correct me if I'm wrong), but my C3 seems to have 225/70/15 on them making them both wider and taller (and thus speedo is out). I've not noticed any ill effects on steering so far.
I'm hoping to use 17 inch alloys and put "smaller" tyres on them to reduce the rolling diameter slightly compared to my current oversized tyres, thus in effect making my total rolling diameter slightly smaller than I currently have / back to standardish diameter.

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Daytona Vette

Club Member

Mon 06 Aug 18 15:20

Re: New alloys - size advice


Maintain the 68 original rolling road circumference of the tyre to help prevent any fouling. Insets and offsets are something else depending what you want and you can go wider inboard with offset trailing arms.

Remember the C3 suspension was designed to work with the higher side wall tyre, so if you are going with low profile tyres on the larger dia wheel, the squarer edge tyre will not work the same way, as it will have less flex in the sidewall - the best way to overcome this is to use smart struts they keep the rear wheels more vertical under cornering load, - But if you go smart struts you may have to custom bend the exhaust pipes at a pinch point to clear.

Of course hardness of suspension and tyre pressures add to the variations - so if you want a Vette that handles better at speed when driving at nine tenths digest the above, but if you are only bothered with looks and the trip down to the supermarket and a gentle cruise, treat my words above as; it will cost you more money for no gain.


--------------------
Barry - Daytona Vette

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