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Old 12-20-2010, 11:33 AM
Yorgi's Avatar
Yorgi Yorgi is offline
Officially Welcomed to the 'Fest
Location: Toronto
Join Date: Mar 2005
Posts: 3,650
Mein Auto: '04 M3 / '06 650i Cab
Runflat positives:
1. Allow you do drive a few miles if you get a puncture.
2. Stiff sidewalls result in very sharp turn-in which improves steering feel.

Runflat negatives:
1. Stiff sidewalls result in harsh ride over expansion-joints and other small bumps. Also causes road noise on some surfaces.
2. Heavy, about +6lb each compared to non-RFT. Wheels are unsprung weight which you want kept to a minimum for many reasons.
3. Expensive. About 2x the price of comparable non-funflat tires. (eg ExtremeContact DWS vs RE050A)
4. Non-repairable. Drive on them for a few miles after a puncture and tire must be replaced.
5. Rare. If you need a replacement and are not located in a major city you will probably have to wait for a tire to be shipped in.
6. Short tread life. The Bridgestone RE050A RFT have poor treadwear ratings.
7. Cold weather performance. Yes this is a performance summer tire but the RE050A performs poorly in comparison to other performance tires in the snow.
Straight lines are for fast cars...turns are for fast drivers
'04 M3 - track
'06 650i Cab - daily driver
'02 Highlander - kid hauler
'01 330Ci - winter beater

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