onmyrt Posted July 24, 2006 Share Posted July 24, 2006 I have just over 9k on my Conti Road Attacks and I'm looking to replace them soon. The front is a 120/70 17 and the rear is a 180/55 17. I want to put an ME 880 on the rear and maybe a Z6 up front. A 120/70 Z6 is easily available online, but I have not been able to find an 880 that is 180/55. Can I run a different size? If so, what size? Link to comment
ShovelStrokeEd Posted July 24, 2006 Share Posted July 24, 2006 The 880 is available in the 180/55 size but, if you can't find one, a 170/60 will work on the 5.5" rim. I have run that combination on my 1100S a few times with no handling or traction issues. I don't think wider would be good, in fact I know it won't. Not even sure a 190 is available, anyway. Normally a 190 requires a 6" wide rear rim. Link to comment
Lawman Posted July 24, 2006 Share Posted July 24, 2006 I ran into the same problem when I replaced tires on my 05 RT. Does the first number indicate tire width and the second number indicate tire heigth? If so, it seems like changing tire heighth would affect indicated speed..Right or wrong? Link to comment
Paul Mihalka Posted July 24, 2006 Share Posted July 24, 2006 The second number is a percentage of the stated width. So 60% of 170 is very close to 55% of 180. Link to comment
tgrrdr Posted July 25, 2006 Share Posted July 25, 2006 The 880 is available in the 180/55 size can you provide a source? when I tried to buy 880's for my RT I was told they weren't available in that size. And, i don't see them listed on Metler's website either (they do list 180/55-18 but I don't think that's a good idea). Link to comment
tgrrdr Posted July 25, 2006 Share Posted July 25, 2006 here's the size chart from metzler's website. Link to comment
ShovelStrokeEd Posted July 25, 2006 Share Posted July 25, 2006 OK, it would seem I was wrong on the 180/55 tire being available, I somehow thought it was. The OP lists his bike as a 1200 RT, which, according to the BMW website comes equipped with a 5.0 x 17 rear wheel. That wheel is entirely suited to the 170/60 sized tire. In fact, it is probably a better fit than the 180/55 OEM tire. Most tire manufacturers specify a 5.5" rim width for that size. My 1100S came factory equipped with a 5.5" rim and a 180/55 rear tire, being a Boxer Cup Prep model. The regular 1100S comes with a 5.0" rim and a 170/60 tire. The consensus on the Pelican Parts 1100S board is that you can run the 170/60 tire on the 5.5" rim and will gain just a bit in ease of turn in. The consensus also has it the going to the 180 tire on the 5.0" rim will slow the steering and could lead to stability problems. The guys there are pretty savvy. I have run a 170/60 tire on my 5.5" wheel with no problems and the feel is as stated. Link to comment
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