02-15-2017, 07:40 AM | #45 |
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I've had a rethink on keeping the stock tyres after driving on them in cold weather where normal "summer" tyres perform badly i.e. < 7C. I was pleasantly surprised by the amount of grip the stock tyres offered to the point that I will likely keep them as the compound must be a little softer than normal for them to work so well in the cold and wet.
Shame the i8 specific compound isn't available in larger S001 sizes! I want larger tyres as a little extra rim protection from the kerbs - the grip levels are fine for a road car. |
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02-15-2017, 08:09 AM | #46 |
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I'll be the g-pig for an focus group experiment.
If someone can give me alternatives for stock turbines. I will buy and try. I could search myself but where is the fun in that!! |
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02-15-2017, 08:33 AM | #47 | |
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02-15-2017, 08:34 AM | #48 | |
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Rear tires to the front and just buy 2 new tires for the rear 275 35 40 Bridgestone Potenza S001 |
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02-15-2017, 12:45 PM | #49 |
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02-15-2017, 01:09 PM | #50 | |
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CONTINENTAL CONTISPORTCONTACT 3 CONTINENTAL EXTREMECONTACT DW DUNLOP SP SPORT MAXX GT GOODYEAR EAGLE F1 ASYMMETRIC 2 RUNONFLAT HANKOOK VENTUS V12 EVO2 MICHELIN PILOT SPORT 4S MICHELIN PILOT SUPER SPORT PIRELLI P ZERO PIRELLI P ZERO RUN FLAT BFGOODRICH G-FORCE COMP-2 A/S YOKOHAMA ADVAN SPORT A/S |
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02-15-2017, 06:35 PM | #51 | ||
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The fuel efficiency and wet grip ratings differ between the 275 and 245 i8 tyre. This means they are not the same compound. |
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02-15-2017, 08:37 PM | #52 | |||
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Rear: 245/40R20 99W Load Range: XL UTQG: 280 A A Sidewall Style: Blackwall Star BMW (original BMW equipment) How you can see the compound is the same 280 A A |
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02-16-2017, 04:17 PM | #53 | ||||
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Here's what is listed on the site I tend to buy tyres from: http://www.oponeo.co.uk/tyre-details...32420799_label This shows the compound as F (efficiency) and B (wet grip - braking) The other 275 available: http://www.oponeo.co.uk/tyre-details...-ro1#124991763 This shows the compound as E (efficiency) and C (wet grip) These are clearly two different compounds and potentially sidewall construction as the ratings are different. Now let's look at the actual i8 tyre: http://www.oponeo.co.uk/tyre-details...w-i8#132037890 This shows the compound as E (efficiency) and A (wet grip) Again different compounds. Highlighted by the wet grip capability. The load ratings of the 275s and the i8 tyres are also different. Potentially highlighting different sidewall characteristics. The 280 A A that you believe means the tyres are the same is not sufficient to make that assertion. Have a read of: https://www.tirerack.com/tires/tiret....jsp?techid=48 One of my friends works for Nissan and his job was specifying and testing the compounds, sidewall construction, etc for their cars. There is a lot more to a tyre'a construction than data you're using. |
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02-16-2017, 04:59 PM | #54 | |||||
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02-17-2017, 01:43 AM | #55 |
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02-18-2017, 09:54 PM | #56 | |
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Do you want to believe him? |
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02-18-2017, 10:10 PM | #57 | ||||||
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And whilst you do, from safety, tyre performance and insurance coverage perspectives please explain why it's ok to fit a much wider tyre to an i8 stock rim when the tyre specifies a wider rim than stock is needed? |
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02-19-2017, 09:17 AM | #58 | |||||||
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Stick to the thread and do something positive thank you.. |
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02-19-2017, 09:22 AM | #59 | ||
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02-23-2017, 09:21 AM | #60 |
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Here is partly what I suspect SteveB is referring to. What follows is a list of available Michelin Pilot Super Sports tires in 20". As you can see, for some sizes there are multiple variants, often engineered specifically to suit can manufacturer specs (e.g., Ferrari or Porsche). There are several variants of Michelin Pilot Sports tires that are possible options. Here is a list of sizes for the MPSS:
225/35ZR20 (90Y) XL 300 AA A 1,323 lbs. 50 psi 10/32" 22 lbs. 7.5-9" 8" 9.1" 8.8" 26.2" 793 FR 235/35ZR20 (92Y) XL K1 Ferrari 300 AA A 1,389 lbs. 50 psi 10/32" 22 lbs. 8-9.5" 8.5" 9.5" 9" 26.5" 786 FR 235/35ZR20 (88Y) SL 2011 Production 300 AA A 1,235 lbs. 51 psi 10/32" 22 lbs. 8-9.5" 8.5" 9.5" 9" 26.5" FR 245/30ZR20(90Y) XL 300 AA A 1,323 lbs. 50 psi 10/32" 23 lbs. 8-9" 8.5" 9.7" 9.7" 25.8" 805 FR 245/35ZR20 (95Y) XL K1 Ferrari 300 AA A 1,521 lbs. 50 psi 9/32" 23 lbs. 8-9.5" 8.5" 9.8" 9.4" 26.8" 777 FR 245/35ZR20 (95Y) XL K3 Ferrari 300 AA A 1,521 lbs. 50 psi 9/32" 23 lbs. 8-9.5" 8.5" 9.8" 8.8" 26.8" 777 FR 245/35ZR20 (95Y) XL K2 Ferrari 300 AA A 1,521 lbs. 50 psi 9/32" 23 lbs. 8-9.5" 8.5" 9.8" 8.4" 26.8" 777 FR 245/35ZR20 (95Y) XL 300 AA A 1,521 lbs. 50 psi 10/32" 23 lbs. 8-9.5" 8.5" 9.8" 8.5" 26.8" 777 FR 245/40ZR20 (99Y) XL Star BMW 300 AA A 1,709 lbs. 50 psi 9/32" 26 lbs. 8-9.5" 8.5" 9.8" 8.7" 27.7" 750 FR 245/40ZR20 (99Y) XL 300 AA A 1,709 lbs. 50 psi 10/32" 26 lbs. 8-9.5" 8.5" 9.8" 8.7" 27.7" 750 FR 245/45ZR20 (103Y) XL 300 AA A 1,929 lbs. 50 psi 10/32" 26 lbs. 7.5-9" 8" 9.6" 8.5" 28.7" 726 US 255/30ZR20 (92Y) XL 300 AA A 1,389 lbs. 50 psi 10/32" 23 lbs. 8.5-9.5" 9" 10.2" 8.8" 26.1" 798 FR 255/35ZR20 (97Y) XL 300 AA A 1,609 lbs. 50 psi 10/32" 25 lbs. 8.5-10" 9" 10.2" 9.2" 27" 770 FR 255/35ZR20 (97Y) RF K2 Ferrari 300 AA A 1,609 lbs. 51 psi 7/32" 25 lbs. 8.5-10" 9" 10.2" 9.2" 27" 770 FR 255/40ZR20 (101Y) XL N0(Porsche) 300 AA A 1,819 lbs. 50 psi 9/32" 27 lbs. 8.5-10" 9" 10.2" 10" 28" 742 FR 255/40ZR20 (101Y) XL 300 AA A 1,819 lbs. 50 psi 10/32" 28 lbs. 8.5-10" 9.5" 10.2" 9" 28" 742 US 255/45ZR20 (105Y) XL 300 AA A 2,039 lbs. 50 psi 10/32" 29 lbs. 8-9.5" 8.5" 10" 9" 29.1" 716 US 265/30ZR20 (94Y) XL 300 AA A 1,477 lbs. 50 psi 10/32" 26 lbs. 9-10" 9.5" 10.7" 10" 26.3" 791 US 265/30ZR20 (94Y) XL Star BMW 300 AA A 1,477 lbs. 50 psi /32" 24 lbs. 0-0" 8.9" FR 265/35ZR20 (99Y) XL Star BMW 300 AA A 1,709 lbs. 50 psi 9/32" 25 lbs. 9-10.5" 9.5" 10.7" 9.7" 27.3" 761 FR 275/30ZR20 (97Y) XL 300 AA A 1,609 lbs. 50 psi 10/32" 26 lbs. 9-10" 9.5" 10.9" 10.1" 26.5" 784 FR 275/35ZR20 (102Y) XL 300 AA A 1,874 lbs. 50 psi 10/32" 27 lbs. 9-11" 9.5" 10.9" 10.1" 27.6" 755 FR 275/35ZR20 (102Y) XL Star BMW 300 AA A 1,874 lbs. 50 psi 9/32" 27 lbs. 9-11" 9.5" 10.9" 9.7" 27.6" 755 FR 285/25ZR20 (93Y) XL 300 AA A 1,433 lbs. 50 psi 10/32" 28 lbs. 10.5-10.5" 10.5" 11.6" 10.5" 25.6" 813 FR 285/30ZR20 (99Y) XL 300 AA A 1,709 lbs. 50 psi 10/32" 27 lbs. 9.5-10.5" 10" 11.4" 10.2" 26.8" 777 FR 285/30ZR20 (99Y) XL K1 Ferrari 300 AA A 1,709 lbs. 50 psi 7/32" 24 lbs. 9.5-10.5" 10" 11.4" 9.5" 26.8" 777 FR 285/30ZR20 (99Y) XL Star BMW 300 AA A 1,709 lbs. 50 psi /32" 26 lbs. 0-0" 9.9" FR 285/35ZR20 (104Y) XL K2 Ferrari 300 AA A 1,984 lbs. 50 psi 9/32" 30 lbs. 9.5-11" 10" 11.4" 10.1" 27.9" 746 FR 285/35ZR20 (104Y) XL 300 AA A 1,984 lbs. 50 psi 10/32" 30 lbs. 9.5-11" 10" 11.4" 10.5" 27.9" 746 US 295/25ZR20 (95Y) XL 300 AA A 1,521 lbs. 50 psi 10/32" 27 lbs. 10-11" 10.5" 11.9" 11.2" 25.8" 805 FR 295/30ZR20 (101Y) XL MO Mercedes 300 AA A 1,819 lbs. 50 psi 10/32" 29 lbs. 10-11" 10.5" 11.9" 9.4" 27" 770 FR 295/30ZR20 (101Y) XL 300 AA A 1,819 lbs. 50 psi 10/32" 29 lbs. 10-11" 10.5" 11.9" 11.5" 27" FR 295/30ZR20 (101Y) XL Star BMW 300 AA A 1,819 lbs. 50 psi 9/32" 29 lbs. 10-11" 10.5" 11.9" 11.6" 27" 770 FR 295/35ZR20 (105Y) XL K1 Ferrari 300 AA A 2,039 lbs. 50 psi 9/32" 30 lbs. 10-11.5" 10.5" 11.9" 12" 28.1" 740 FR 295/35ZR20 (101Y) SL K1 Ferrari 300 AA A 1,819 lbs. 51 psi 9/32" 31 lbs. 10-11.5" 10.5" 11.9" 11.6" 28.1" 740 FR 295/35ZR20 (105Y) XL N0(Porsche)300 AA A 2,039 lbs. 50 psi 9/32" 30 lbs. 10-11.5" 10.5" 11.9" 11.5" 28.1" 740 FR 305/25ZR20 (97Y) XL 300 AA A 1,609 lbs. 50 psi 10/32" 27 lbs. 10.5-11.5" 11" 12.3" 11.1" 26" 801 FR 305/30ZR20 (103Y) XL K3 Ferrari 300 AA A 1,929 lbs. 50 psi 9/32" 31 lbs. 10.5-11.5" 11" 12.3" 11.4" 27.2" 764 FR 305/30ZR20 (103Y) XL 300 AA A 1,929 lbs. 50 psi 9/32" 31 lbs. 10.5-11.5" 11" 12.3" 11.8" 27.2" 764 FR 315/35ZR20 (110Y) XL K1 Ferrari 300 AA A 2,337 lbs. 50 psi 7/32" 33 lbs. 10.5-12.5" 11" 12.6" 11.5" 28.7" 726 FR 315/35ZR20 (110Y) XL K2 Ferrari 300 AA A 2,337 lbs. 50 psi 10/32" 34 lbs. 10.5-12.5" 11" 12.6" 11.6" 28.7" 726 FR 325/25ZR20 (101Y) XL 300 AA A 1,819 lbs. 50 psi 9/32" 31 lbs. 11.5-12.5" 12" 13.2" 13.1" 26.3" 788 FR 335/30ZR20 (108Y) XL N0(Porsche) 300 AA A 2,205 lbs. 50 psi 9/32" 35 lbs. 11.5-12.5" 12" 13.5" 13" 28" 744 US 345/30ZR20 (106Y) SL 300 AA A 2,094 lbs. 51 psi 10/32" 35 lbs. 12-13" 12.5" 14" 12.7" 28.1" 716 FR
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02-23-2017, 11:16 AM | #61 |
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I've opened another thread on this specifically for MPilot Super Sports. Hopefully somebody can help, If you fancy a £170 experiment you can get a Michelin Pilot Super Sport slightly wider for the front, Michelin do the rear sizes, i just need someone to tell me if it rubs. I would have thought 5mm would be fine on either side????
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02-25-2017, 04:51 PM | #62 | |||
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You haven't a clue who I am, what I do or what the guy with 14 years of alleged experience really does either. His posting looks to me like classic forum bullshit/trolling/whatever. All I'm asking are questions about tyres and suitability for our cars from a safety and legality perspective. But he's chose. To throw his toys out of the pram and not to answer. Perhaps because he can't... I don't work for a tyre company. But I said I did on a forum so that must make it true. Like Mr 14 years said he has worked in the tyre industry on a forum so that must be true also - or perhaps not? I actually worked for three Anti-Virus companies for 20 years but I don't know how to write a computer virus (Malware as they are more fashionably called!). So 14 years in the tyre industry may still make him unable to answer my questions.... The sad thing is that he can't even bother to answer some basic questions about tyres which his boasting of 14 years of experience in the industry would suggest he should be perfectly capable of. And in the spirit of the forum and helping fellow enthusiasts it would be nice to learn for his experience - if he actually has any!?! But I'm not too interested now and will have a word with my friend who I know does know his stuff! |
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02-25-2017, 04:55 PM | #63 | |
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I'm going to my friendly tyre place soon and getting them to switch front and rear tyres on one side to see if they fit, look ok and clear. And I'll catch up with my friend who I know and trust who has done some real work in the auto industry on tyre specification. |
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02-26-2017, 03:07 PM | #64 | |
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http://bmwi.bimmerpost.com/forums/sh...4&postcount=20
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