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I thought I posted about this yesterday but may have forgotten to hit send!
Hit a pothole and either unseated my tire or tore it. Regardless, its shot now and my new trim ring has a slight ding.
So I have a few questions
1) Why is the rear tire shorter than the front? Seems a 295/30/20 would be a better fit
2) Does a 295/30/20 fit? On the detroit wheel that is. I wouldnt mind some more width and a but more sidewall/
I had just changed two of these conti extremes last year after the originals were dry rotten. So I'm looking for other options
It's meant to be that way, I don't understand why though. If you want a deeper side wall I would suggest going with the 19" or better yet the 18" wheels. I plan to do this at some point. Maybe sure you get the Hydra wheels though as the other wheels as far as I know won't fit the Brembo brake calipers properly.
SlowPoke,
1). The standard Tyre for rear Detroits is 285/30 ZR20. Translated, this means 285mm Wide / Sidewall 30% of width / 20inch inner Diameter. Since the front tyres are narrower, then the Sidewall % is slightly higher (255/35 ZR20) to be a closer match.
2}. I think you could get away with 295’s which will be just 10mm wider but the ideal solution is to get tyres with thicker sidewall moulding (see pic). These are designed to protrude beyond your wheel rim for added protection. Different Tyre manufacturers have an acronym for it; MFS – Maximum Flange Shield, FSL – FelgenschutzleisteFlange Shield, FR - Flange Rib, RFP - Rim Fringe Protector, FP - Fringe Protector.
SlowPoke,
1). The standard Tyre for rear Detroits is 285/30 ZR20. Translated, this means 285mm Wide / Sidewall 30% of width / 20inch inner Diameter. Since the front tyres are narrower, then the Sidewall % is slightly higher (255/35 ZR20) to be a closer match.
2}. I think you could get away with 295’s which will be just 10mm wider but the ideal solution is to get tyres with thicker sidewall moulding (see pic). These are designed to protrude beyond your wheel rim for added protection. Different Tyre manufacturers have an acronym for it; MFS – Maximum Flange Shield, FSL – FelgenschutzleisteFlange Shield, FR - Flange Rib, RFP - Rim Fringe Protector, FP - Fringe Protector.
Thanks. I'm familiar with the factory size and what the numbers mean. I actually didn't know there was a rim flange protection rating all though I've notice certain tires definitely have more of an overhang. Unfortunately with these the trim rings can get damaged by the tire itself.
My thinking with the 295 is that Both the extra sidewall and width although minimal, will help. I'm sure someone tried fitting this size. I know it will be fine on the time just don't want it running anywhere. As far as 19"s I have them on my other xkr as I didn't want to go with 20's this car however is stock and I want to keep it that way.
I never change the manufacturers tire size on a OEM rim. Doing this can risk your life. These 10" rims are made for 285 tires. Going wider to look cool to the locals puts the sidewalls in stress...not good, they can fold over in full-out cornering and blow out when the bead opens. If the rims were 12", you could go to 300+ widths...but they're not!
I never change the manufacturers tire size on a OEM rim. Doing this can risk your life. These 10" rims are made for 285 tires. Going wider to look cool to the locals puts the sidewalls in stress...not good, they can fold over in full-out cornering and blow out when the bead opens. If the rims were 12", you could go to 300+ widths...but they're not!
its marginally wider than recommend Which is 285mm. Has nothing to do with looking cool. Has to do with not bending rims and or tearing tires. The chances of me hitting a pothole cracking a rim and or ruining a tire and crashing due to that is far greater than me cornering at a racetrack full g's and having my tires fly off because it's 10mm wider. It's a risk I'm willing to take. That is if it doesn't run anywhere
... If you want a deeper side wall I would suggest going with the 19" or better yet the 18" wheels. I plan to do this at some point. Maybe sure you get the Hydra wheels though as the other wheels as far as I know won't fit the Brembo brake calipers properly.
+1 Great response. Any vehicle not dedicated for track or showrooms has no advantage to no sidewall tires or oversized/Brembo calipers. Quite the opposite as you have experienced like so many others, they greatly increase chance of torn tires and cracked rims.
On another note though, watch new tires closely for weeks after purchase, I just had a brand new set of Yokohama's on my wife's daily driver (a VW passat) get a tear in sidewall, by the time I got it in for them to look at because I thought she hit a pot hole, the opposite sidewall was separating from the tread and it's getting sent to manufacturer as defective. This was only about 3 weeks ago with Discount tire, tires were 2 months old. If she had hit a pot hole or driven out of town it would have blown from stress or heat.
Detroit 20" rear tire 290/30/20 ?
