Rich Posted March 7, 2018 Author Report Share Posted March 7, 2018 They were terrible. I'd rather carry a spare and have a quieter drive than put up with that. The actual ride comfort didn't feel that much softer than the runflats though. Quote Link to comment Share on other sites More sharing options...
Tony Posted March 7, 2018 Report Share Posted March 7, 2018 They should feel a little more fluid and a lot less likely to crack the rims.....Point tp note is BMW don't fit RFT's on the M series i wonder why Quote Link to comment Share on other sites More sharing options...
Rich Posted March 7, 2018 Author Report Share Posted March 7, 2018 That's an interesting fact! Are BMW the only manufacturer who uses them? Quote Link to comment Share on other sites More sharing options...
Tony Posted March 7, 2018 Report Share Posted March 7, 2018 Yes.... Some other cars use RFT's but that's a one off rather than the entire range. Quote Link to comment Share on other sites More sharing options...
Sagitar Posted March 12, 2018 Report Share Posted March 12, 2018 Too my knowledge all BMW's are on the RFT apart from the M series. The handling is fair on the X1 although the tyres do tramline and are rather noisy, oh and they cost the earth as well. Sorry to be so tardy in responding to this one, but I was waiting for the chance to speak to my daughter about it. She bought a new X1, just about a year ago and I seemed to recall that it did not have run-flats. When I spoke to her yesterday she said that run-flats or not is one of the many options that can be chosen when setting up the specifications for a new X1. She chose not to have run-flats. She was very pleased with the handling of the (four wheel drive) X1 when driving around Colchester in the extremely bad road conditions that have prevailed there recently. 2 Quote Link to comment Share on other sites More sharing options...
Tony Posted March 12, 2018 Report Share Posted March 12, 2018 Thanks for the real time exposure regarding the RFT's. I wasn't aware they are part of an option pack but this also opens some questions? I was told the BMW wheel was composite to reduce unsprung weight and the suspension was downgraded as second line of defence from the tyres concussion migrating to the cabin. Oddly there's no geometrical difference that I'm aware of so I'll look into that since i have totally different settings for the RFT developed in house so i wonder where BMW place both chassis geometrically? Quote Link to comment Share on other sites More sharing options...
Rich Posted March 12, 2018 Author Report Share Posted March 12, 2018 Sorry to be so tardy in responding to this one, but I was waiting for the chance to speak to my daughter about it. She bought a new X1, just about a year ago and I seemed to recall that it did not have run-flats. When I spoke to her yesterday she said that run-flats or not is one of the many options that can be chosen when setting up the specifications for a new X1. She chose not to have run-flats. She was very pleased with the handling of the (four wheel drive) X1 when driving around Colchester in the extremely bad road conditions that have prevailed there recently. That's good to know, I assume the car is on normal Bridgestone tyres supplied by BMW? Is it the 2.0 auto diesel? The runflats are an optional extra but it's ticked as a yes by default, you have to remove the option to have the normal tyres. Another option is adaptive suspension which allows you to change the dampers from soft to normal. I thought the ride was fine without this option but I can see it being more beneficial on runflat tyres over normal ones. Quote Link to comment Share on other sites More sharing options...
Sagitar Posted March 13, 2018 Report Share Posted March 13, 2018 I don't know much detail Rich. It's petrol not diesel and it's certainly automatic. I took a few pictures when she brought it home to show off and from the pics I can see that it is marked X drive 2.0i. I can also see that it is on Bridgestone Turanzas. Of the suspension, I'm afraid I know nothing. Quote Link to comment Share on other sites More sharing options...
Tony Posted March 13, 2018 Report Share Posted March 13, 2018 I wonder how they get away with the tyre option?...I mean they handle so differently RFT and non RFT. Maybe that's why the suspension has different settings. I can only assume the dampers are magnetic. Quote Link to comment Share on other sites More sharing options...
Rich Posted March 13, 2018 Author Report Share Posted March 13, 2018 I guess they are trying to get more people to use runflats by giving them as a free extra. I guess some people don't really care, won't check and will expect it to come with normal tyres. I drove an xdrive 2.0 diesel sport auto and an sdrive 1.8 diesel se manual. The suspension was the same on both but they have different seats which affects the comfort too. The auto was much nicer to drive though! Quote Link to comment Share on other sites More sharing options...
Tony Posted March 14, 2018 Report Share Posted March 14, 2018 The fact RFT is a default then yes BMW must be pushing the option.... I rest my case at the fact BMW do not fit them on the M series. Quote Link to comment Share on other sites More sharing options...
Rich Posted March 14, 2018 Author Report Share Posted March 14, 2018 Yes the option isn't ticked by default on the M Sport models. I wonder how long runflats will last for, no one seems to like them and they haven't really been adopted by other manufacturers. Quote Link to comment Share on other sites More sharing options...
Tony Posted March 14, 2018 Report Share Posted March 14, 2018 Versions of the RFT has been around for years and all of them failed. This time the car manufacturers have embraced the RFT but i think this is more about money that being they don't need to supply a spare tyre ( space saver ) or tools which is a requirement if driving on the motorway. Quote Link to comment Share on other sites More sharing options...
Rich Posted March 16, 2018 Author Report Share Posted March 16, 2018 If the runflat option is left ticked BMW supply a can of goo and compressor. Uncheck it and they supply a jack instead but the space saver has to be paid for. Although £75 is pretty good, Lexus want double that for a new one. Quote Link to comment Share on other sites More sharing options...
Tony Posted March 17, 2018 Report Share Posted March 17, 2018 A can of goo and compressor won't help if it blows out?......What do they think you're going to do, stuff the can in the hole Quote Link to comment Share on other sites More sharing options...
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