Cracked Wheel... now have questions.
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Joined: May 2004
Posts: 412
From: Toronto, Ontario
Cracked Wheel... now have questions.
Just found out my front right wheel has a crack on the inside of the outer 'rim' (I have the stock 96 SS ZR1 replica wheels - 275/40/R17's all around painted silver)
Now I have some questions.
1) What are the dimentions of my wheels? 17 x 9? If so... why do 275's fit? (9 inches is only about 230mm... how does this work?) Also... what is the offset?
2) How safe are welded wheels? (tig welded by an expert of course). Is this common?
3) What are the widest 17 inch wheels I can fit on the rear? My stockers fill the front wheel wells nicely... but they look a tad small on the rear. The ZR1's can be had up to 17 x 11 right? How do they look?
Thanks!
Now I have some questions.
1) What are the dimentions of my wheels? 17 x 9? If so... why do 275's fit? (9 inches is only about 230mm... how does this work?) Also... what is the offset?
2) How safe are welded wheels? (tig welded by an expert of course). Is this common?
3) What are the widest 17 inch wheels I can fit on the rear? My stockers fill the front wheel wells nicely... but they look a tad small on the rear. The ZR1's can be had up to 17 x 11 right? How do they look?
Thanks!
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Joined: Nov 1998
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From: Hell was full so they sent me to NJ
Re: Cracked Wheel... now have questions.
Do you mean you have a stock SS wheel?
Stock SS wheels are 17x9.0" with a 50mm offset.
Tire "width" (the '275' number) refers to the tire's "section width". That means, at the tire's widest point on the sidewall, it is approximately 275mm (10.8" wide. Per the recommendations of most manufacturers, that tire will fit correctly on wheels ranging from 9.0" to 11.0" wide.
The cross-section of the tire is an oval. The section width is the max width of the oval. The contact points for the tire beads are not the widest point on the oval, but are at a narrower point on the oval.
And, a 9.0" wide wheel is actually about 10.0" wide. The "nominal" (or quoted) width of the wheel is measured inside the edges of the wheel, at the point where the tire bead contacts the rim. The side "flanges" typically add 1/2" to each side of the wheel.... so now you have a 254mm wide wheel, with a 275mm wide section width tire, meaning the "bulge" of the tire widewall sticks about 10.5mm (.41") outside the edge of the wheel.
A properly welded wheel can be as strong as the original wheel. I've seen widened and narrowed wheels about which I had no question of the integrity of the workmanship. But you need to find a shop that knows what the are doing. Repairing your stock wheel may well cost more than simply finding a replacement on eBay.
The use of 17x11 ZR1 wheels and 315/35-17 tires is fully explained in the FAQ stickied at the top of the page. There is also information regarding what tires fit on what wheels, what size tires approximate the outside diameter of the stock wheels, and what terms like "offset", "section width", etc. mean.
Stock SS wheels are 17x9.0" with a 50mm offset.
Tire "width" (the '275' number) refers to the tire's "section width". That means, at the tire's widest point on the sidewall, it is approximately 275mm (10.8" wide. Per the recommendations of most manufacturers, that tire will fit correctly on wheels ranging from 9.0" to 11.0" wide.
The cross-section of the tire is an oval. The section width is the max width of the oval. The contact points for the tire beads are not the widest point on the oval, but are at a narrower point on the oval.
And, a 9.0" wide wheel is actually about 10.0" wide. The "nominal" (or quoted) width of the wheel is measured inside the edges of the wheel, at the point where the tire bead contacts the rim. The side "flanges" typically add 1/2" to each side of the wheel.... so now you have a 254mm wide wheel, with a 275mm wide section width tire, meaning the "bulge" of the tire widewall sticks about 10.5mm (.41") outside the edge of the wheel.
A properly welded wheel can be as strong as the original wheel. I've seen widened and narrowed wheels about which I had no question of the integrity of the workmanship. But you need to find a shop that knows what the are doing. Repairing your stock wheel may well cost more than simply finding a replacement on eBay.
The use of 17x11 ZR1 wheels and 315/35-17 tires is fully explained in the FAQ stickied at the top of the page. There is also information regarding what tires fit on what wheels, what size tires approximate the outside diameter of the stock wheels, and what terms like "offset", "section width", etc. mean.
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