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Looking for 275 40 ZR 16. All intrest in this tire size.
I have a pair of rear 9x16CS rims and would really like to have wider street tires on the rear. Im looking for 275 40ZR16. I would like to see how many others would like to see a nice 275 40ZR 16 performance tire made for the 9x16 rims. Maybe with enough intrest in that size a tire company would make it happen.
I have 16 x 9" rears on my race car - can't imagine the added value of a 275 tire honestly, nothing wrong with it though. When I put my 275 width 17" next to the 16" 245s I can't even tell the difference.
Yeah, Grassroots Motorsports has done several tires tests recently in which they concluded that there is no advantage in running a tire with a section width that's any wider than the rim width. In other words, for a 9" rim, a 225-245 tire is about where you want to be. I know, it goes against everything we've all believed our whole lieves, but they have data to back it up. Whlle there doesn't seem to be any downside to going wider (within reason) other than cost, there's no benefit, either.
Well the 245 45 16 that I have on my 8x16 fit just right and when that same tire is on the 9" I see the sidewall taper out to the rim and have less rim protection. I was thinking if an inch or so was added to the width it would look better and perform better. I don't believe that test at all. That just doesn't make sence at all. I have 245 45 18 front and 285 40 18 rear on my track car and it handles a turn much faster then my 944 with 205 55 16 front and 245 45 16 rear. But your all trying to sell me that a 245 width tire has the same grip as a 275 width tire? I'm just not seeing it. I'm not looking for sidewall bulge, in fact I think it would set the sidewall that has a reinforced sidewall for curb protection to set more vertical to the rim like the 245 sets on the 8" and not taper out to the rim like the 245 does on the 9" rim.
Go put a 225 on a 9" wide rim and see how it looks. Even though 9" is 228.6mm the 225 looks funny on the 9" rim. I do see if the tire way to wide how the sidewall can fold under cornering but I don't think 275 is to wide for the 9" rim. Maybe just on the edge of to wide but it would also help protect the rim from the curb. Even a 265 45/40 16 would be a nice option to run if they were available.
265/45 16" is available from kumho in R rated tire. I will use this on the rear on my Turbo Cup and 245 on the front. I have 9" and 8" phonedials. I hope this setup will perform as well as my old setup with 285/18" and 265/18". I think these cars feel and look so much better on 16" than on bigger wheels.
Tire tread and section width and rim size recommendation varies between tire manufacturers. I had a set of Goodyear Eagle F1 GS-D3's in 255/45 - 17; (specs from Tire Rack website) specs for this tire are rim recommended width 8-9.5"; section width 9.9" and tread width 8.4" based on a 8.5" rim width. I recently replaced these tires with a set of Bridgestone RE71R's in 255/40 - 17's; rim recommendation 8.5-10"; section width 10.2" and tread width 9.6" based on a 9" rim. I had these tires mounted on 10"x17" rims; the Goodyear's appeared the sidewalls were being stretched out to meet the rim where the Bridgestone sidewalls almost appear vertical with little or no stretching. The Bridgestone's have over 1" more tread width than the Goodyear's for the same tire width; the Bridgestone's 255's are almost the same size as Goodyear's 275's (10.8" cross section and 9.4" tread width based on a 9.5" rim width). The 225 fronts also had the same result mounted on 9"x17" rims.
Everything that's super wide for a 16" rim is usually less than 140tw, which will give you the traction of a much wider wheel in a narrower package at the expense of tire life.
Porsche OEM specs tend to favour the narrower end of the available tyre sizes for a given rim width. 225 for 8" rims and 245 for 9" rims. The Turbo Cup cars ran 245 and 255 on the same size rims. Bridgestones max recommended 45 series tyre width for a 9" rim is 285 so 275 should be ok in theory but I personally would always favour the stiffer narrower option vs the softer over sized option. The tables below give the Bridgestone recommendations for 45 and 50 series tyres. The bold numbers are their 'ideal' rim widths for a given profile.
If there was a 255/40 R16 tyre available I'd go 245/45 16” on the front, and 255/40 16” on the rear ... but since there isn't I beleive the best set up for 8"/9" rims is 225/50 and 245/45. 265/45 is an interesting thought for the rears but rolling diameter is larger than the front options.
11-12-2015, 06:54 PM
Looking for 275 40 ZR 16. All intrest in this tire size.
