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Changing My RFT
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11-05-2014, 10:24 AM | #1 |
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Changing My RFT
At present I have the following RFT on my 320D M Sport. These tires are way to hard for my location, but might be ok if you have grade A black top roads.
Front 225 x 40 x 18 Rear 255 x 35 x 18 These tires are in my opinion not suitable for this car, so I plan at some point to fit non RFT and was looking at Pilot Sport 3 that are available at my location. Due to the crap roads I am thinking of perhaps fitting the following. Just checking if there would be any issues ? Any input would be a big help. Front 225 x 45 x 18 Rear 255 40 x 18 |
11-05-2014, 11:14 AM | #2 |
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With that higher profile your overall wheel diameter will increase by about 3.5%, so at 70mph your speedometer will be reading 73mph. Why not stay with the OEM size? You'll find a great improvement with non-runflats even if you don't up-size...
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11-05-2014, 12:42 PM | #3 |
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Stick with original sizes
Non rft compared to rft's is amazing My standard wheels were 16" rft's and i would say my 18's with non rft's ride more comfortably Rft's are the work of the devil |
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11-05-2014, 12:46 PM | #4 |
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11-05-2014, 08:07 PM | #6 | |
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The upsize was only just an idea, as per the feed back I will go ahead and stay with the OEM size. Also just checking on the following regarding width, would it be possible to move up one size with the non RFT. Front 235 x 40 x 18 Rear 265 x 35 x 18 |
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11-06-2014, 04:37 AM | #7 |
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Depends om the offset of your wheels. You could get some rubbing issues with the wider treads...
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E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front
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11-06-2014, 07:22 AM | #8 |
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11-06-2014, 07:42 AM | #9 | |
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WM |
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11-12-2014, 02:57 PM | #10 |
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Hi I've got these sizes on mine too, does anyone know if I change to non run flats will I get messages on the I drive screen warning of pressure loss? I believe there's sensors in the runflats that send signals to the cars brain. Or am I totally wrong? Thanks
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11-12-2014, 03:09 PM | #11 | |
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I just recently moved to non-RFT and am really surprised at the difference it made when going over imperfections in the road. I wasn't convinced, but now that I've experienced both I would recommend it.
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11-13-2014, 03:57 PM | #12 |
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Thanks ess
Think I'll have to do it then . I have the nav pro widescreen and when the warning message comes up I loose a half inch off the top of the screen when pressure loss is detected. It stays like this until I reset it. As long as I can still reset it when using non runflats I'd be happy. |
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11-13-2014, 04:59 PM | #13 | |
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11-13-2014, 06:39 PM | #15 | |
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As long as you reset the TPMS after changing the tyres (so the car re-learns what your wheels rolling radius is) you won't get any warnings. |
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11-14-2014, 04:39 AM | #17 |
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265 too wide for oem 18inch wheels...i wanted to go wide too
But restricted by the wheel size |
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11-14-2014, 05:54 AM | #18 |
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11-14-2014, 06:25 AM | #19 |
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When making the switch to non-RFT's, do the same tyre pressures quoted on the driver side door still apply (assuming the tyre is the same width/profile etc)?
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11-14-2014, 08:26 AM | #20 | |
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you can go 235 for the fronts tho...and actually i think that 235 or even 245 should be std at the front as it improves handling and reduces understeer.... |
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11-14-2014, 08:47 AM | #21 |
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11-14-2014, 10:22 AM | #22 |
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It's always seemed to me to be rather a paradox that these Run Flat Tyres - designed to work at zero pressure (albeit with limited speed and range) - need such relatively high pressures in normal use the rest of the time !!
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