02-05-2015, 05:44 PM | #1 |
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275-35 front - 295-35 rear OEM Black wheels
OEM 275-35 rear tires mounted on front wheels and 295-35 on rear, Michelin PSS
What do you think? the car drives great! Next step, H&R springs. |
02-05-2015, 06:39 PM | #4 |
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Interesting and smart approach. Also interested about feedback on the handling. Any rubs?
My front tires are shot from a track weekend. So I am considering doing the same thing, moving my rears up front and buying a new set of rears. Please share more driving impressions |
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02-06-2015, 06:09 PM | #5 |
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Wow, it looks good. It's not pudgy or anything.
I don't know what the contact patch difference is between the two is.
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02-06-2015, 06:39 PM | #6 |
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Looks great. This will be my next setup.
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02-06-2015, 07:19 PM | #7 |
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This will work fine with the OEM suspension and bump stops but any increase in travel will result in rubbing, due to the larger overall diameter. I wouldn't be surprised if you start to see some rubbing on the H&R sports but report back, as I'm not sure!
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02-07-2015, 07:21 AM | #8 |
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The rolling radius is only larger by ~¼". You think that is enough to cause rubbing?
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02-09-2015, 03:20 PM | #10 | |
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Since the tire will be centered, it will stick out !0.39" on each side. Another consideration is the tire vs. wheel width. Front wheels are 9JX18 ET:29 or 9JX19 ET:29. Rear wheels are 10JX18 ET:40 or 10JX19 ET:40. Michelin recommends both 275/35-18 and 275/35-19 tires to go onto 9-11" wide wheels. So 9" OEM wheel is at the minimum acceptable width, but still OK. Similarly, both 295/35-18 and -19 are good to go onto 10-11.5" wheels, so rear 10" wide wheels are minimally acceptable. http://www.tirerack.com/tires/tires....ndard%20Brakes a
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02-09-2015, 06:14 PM | #11 | |
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Some folks are running up to 20mm spacers front and rear without rubbing and 15mm spacers are very popular. Since the rear tires in the OP stick out by 15mm, it should not cause any rubbing IMO. After further research, I might opt for a 265/285 /35R19 setup. The 295/35R19 are significantly more expensive than the 285/35R19. On the vendor sites I checked, the 295 are ~26% more expensive than the 275 while the 285 are only ~3% more expensive. However, that extra rubber on the road of the 295 sure is tempting.
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02-09-2015, 06:18 PM | #12 |
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This definitely fills out the rear wheel well better!
The M4 rear wheel looks a bit like a scrawny guy wearing a polo shirt where his bicep isn't big enough to fill in the arm hole so it looks awkwardly too large, flaps in the wind... |
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02-09-2015, 08:39 PM | #13 |
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There has been a lot of comments made by a lot of you on moving to 275/295, but how do any of us really know the width will provide better grip? Psychologically I would think that 295 rears would help, but what testing has been done to show this proves better grip? 1.2" increase in width on the rear can't cure 50% of the grip issues I would guess. I raise not to stir the pot, but hopefully become more informed about a future purchase.
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02-09-2015, 08:44 PM | #14 | |
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The 295 has a contact patch that is 18% (1.7") wider that the F8X specific 275. It is not negligible.
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02-09-2015, 09:02 PM | #15 |
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I get the 18% increase in contact surface and I read your post and liked the analysis you did! It helped. What I am really trying to figure out is how much better the grip is in "butt-testing" with the OP and ultimately in real-world measurement/testing. The increase is radius does concern me though for the 275/295 35 widths. The 265/285 scenario only adds 5% increase in contact. Do straightline 0-60 and 1/4 mile times increase by 1/10th (or whatever) of a second? Do they not? Lateral acceleration improve? If so by how much? The answers to these questions are good to have, but if no one tests then I'll have to go buy and test on my own. It would be nice if BMW did an in-depth article like they have on other topics on why they chose the tire sizes and what they tested and why?
Last edited by rmedeir1; 02-09-2015 at 09:14 PM.. |
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02-10-2015, 01:35 AM | #16 | |
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Also remember contact patch doesn't change in overall size, rather shape for a given air pressure. |
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02-10-2015, 01:46 AM | #17 | |
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275/35 vs 255/35 vs 295/35 You have 20mm * 35% = 8.89mm or .35" which is yes enough to rub By the actual specs on Tire Rack: 255/35r19 is 26" overall 275/35r19 is 26.6" 295/35r19 Is 27.1" Divide by 2 to get radius and still similar and yes, I suspect you will rub. Let me know what you find, might be more clearance than I think. Definitely if you end up with coilovers that increase suspension travel. (Ie if you get the Dinan 435i bits that increase travel) |
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02-10-2015, 01:50 AM | #18 |
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We really need the track guys posting their tire setups and lap time comparisons... Can anyone who has this info post it and help us guys looking to buy a good wheel and tire track setup? Street setup you can go crazy as far as I'm concerned. Whatever looks cool and doesn't rub
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02-10-2015, 07:43 AM | #19 | |
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20mm * .35 = 7mm = 0.275" (pretty darn close to a 1/4", isn't it ) The dimension in inches on the Tire Rack website are rounded off. From the Michelin website: 255/35r19 is 661mm 275/35r19 is 675mm 295/35r19 Is 689mm There is the same 14mm difference in dia between each, so 7mm in radius. But I get what you are saying. Wider tires combined with increased radius does increase the probablity of rubs with a lowered suspension.
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02-10-2015, 07:50 AM | #20 | |
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EDITED to correct eroneous info Agreed.
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02-10-2015, 12:33 PM | #21 | |
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I've stacked a set of 275/35r18s next to an identical set, 1 mounted on 18x9 and 1 mounting on a set of 10s and the difference was HUGE. They looked slightly pinched on the 9s and pretty straight up and down with the 10s and there was over 4" of difference in the total stack height. I was shocked. That's why it is key to keep in mind the width of the wheel. |
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02-10-2015, 02:58 PM | #22 | |
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