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Thread: R1150RT Tire Size question

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  1. #1
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    R1150RT Tire Size question

    I'm replacing the Pilot Roads on my 2004 R1150RT. I note however that the factory size for the rear is 170/60 ZR17, but the previous owner was running a 180/55. Is anyone else using this size? Are there pros and cons of doing this?

  2. #2
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    no advantage in fitting a larger tire. usually done for 1 of 2 reasons: the "ok reason" is because that was what was available, or the price was stupid good. the "not ok reason" is someone believed the old racing adage that a larger tire was "faster". it ain't, at least not for your purposes.
    Ride Safe, Ride Lots

  3. #3
    Registered User roger 04 rt's Avatar
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    6th gear is already too high for the 1150RT, meaning that the engine is turning only 6,250 RPM at 125 miles per hour. The peak horsepower isn't till about 7250. So it seems that a smaller tire in 6th gear might lead to a higher speed because you could get to higher engine RPMs.

  4. #4
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    handling will not be better with the fatter tire on an RT, unless the wheel is sized for it. even then, handling will not necessarily be better. that is what i was attending to in my response.
    Did the RT ever get the 5.5" wheel?
    Ride Safe, Ride Lots

  5. #5
    Left Coast Rider
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    Quote Originally Posted by Roger 04 RT View Post
    So it seems that a smaller tire in 6th gear might lead to a higher speed because you could get to higher engine RPMs.
    I understand where you're coming from however the 180/55 is actually smaller in diameter than the 170/60.

    To answer the OP's question, I suspect you have a 5" wheel width. If yes, I'd stick with the 170.

  6. #6
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    It may be very difficult to get the wheel on and off with the fat tire. I have a hard time with the 170. I have to loosen the exhaust muffler and move it out of the way. Even then it is a chore.

  7. #7
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    Quote Originally Posted by EMSimon View Post
    It may be very difficult to get the wheel on and off with the fat tire. I have a hard time with the 170. I have to loosen the exhaust muffler and move it out of the way. Even then it is a chore.
    Couldn't you just deflate the tire?

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