can I fit tire size 180 on rear?

[Stephane]

I have a spare rear tire from my previous bike, an FJR, which is a Roadsmart III size 180/55zr17. Could I put it on the Trophy?
It takes a 190 I think. But I don't know enough to to know if it's a viable option.

[Coconut]

Personally, I'd see if I could sell that smaller tyre, and stick with the size specified.

[Yaga1973]

Both the profile and the diameter are different between those two tires.  Not sure about the mounting requirements for a 180 vs 190.  Like Coconut said, I'd stick with the stock size to maintain handling characteristics unless those are something you are wanting to change.

[Stephane]

Thanks.
Since the FJR is in the same class as the Trophy I thought it was worth asking.

[rpeters549]

If you did, expect the speedo to be off even more.  You would also need to check the weight rating as the TTSE is heavy.
I have a 200 on the rear so that I could get into a better touring compound tire (Metzler 888) so my speedo is SLIGHTLY more accurate than with the stock tire size.
Any handling difference is negligible for the average non-track rider.  But it could put rotations out of spec and interfere with the anti-lock system.  My 200 didn't, but don't know about a smaller tire.

[dietDrThunder]

Originally Posted by rpeters549

If you did, expect the speedo to be off even more.  You would also need to check the weight rating as the TTSE is heavy.
I have a 200 on the rear so that I could get into a better touring compound tire (Metzler 888) so my speedo is SLIGHTLY more accurate than with the stock tire size.
Any handling difference is negligible for the average non-track rider.  But it could put rotations out of spec and interfere with the anti-lock system.  My 200 didn't, but don't know about a smaller tire.

Me too on all counts...same tire. There is a clear difference imo w that rear in turn-in; it's lighter and more linear. I'm pretty sure it's due to the slight reduction in trail and rake as a result of the tire being slightly taller, but I do agree that it is a small difference.

I bring it up because regarding the use of a 180, I would not do that as I'm confident that the gain in rake and trail would make the bike feel vague when turning in, require more effort, and it would stand up at lean on the brakes more. Then again, people run car tires on em and claim that the handling isn't abysmal ( I tried it...it was abysmal) so what do I know lol.
 

[rpeters549]

👍
I was a Darksider with my 2000 GL1500. Loved it! Scraped pegs (well, metal anyway) regularly and loved the lower cruising rpm's. I ran the Austone (175/80/16).
This bike? I would not even consider a smaller rear tire. Larger, yes. Darkside... Still debating it.

[Stephane]

I ended up putting the standard size 190 RoadSmart III today.
I was asking about the 180 to save some money since I have it in the garage. But it was not new, so after reading your comments I decided it was not worth it.
Thanks for the feedback.