Tire Size - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 17 (permalink) Old 06-11-2010, 02:53 AM Thread Starter
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Tire Size

Is anyone running a 180/55/17 or 190/55/17 and what if any adjustments did you have to do for the two tires sizes. I'm tried to decide what sizes to go with.
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post #2 of 17 (permalink) Old 06-11-2010, 08:48 AM
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I've run 180's, but I prefer 190/55. I lowered the front 3mm and shimmed the rear up 5mm and I'm happy with it.

Last edited by ChipG; 06-11-2010 at 12:23 PM.
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post #3 of 17 (permalink) Old 06-11-2010, 11:47 AM
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tire

i ride with a 190/55, and it goes to the limit.. 190 rullez
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post #4 of 17 (permalink) Old 06-11-2010, 11:51 AM Thread Starter
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Did you have to make any adjustments, I think thats what I'm going to go with
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post #5 of 17 (permalink) Old 06-11-2010, 08:38 PM
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I did the same as Chip lower my forks to the first line and the rear is raised like 8mm

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post #6 of 17 (permalink) Old 06-12-2010, 09:03 PM
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If you don't mind me asking what advantages did you get out of lowering the front and raising the back end. Just curious if its something I should do to mine.
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post #7 of 17 (permalink) Old 06-12-2010, 09:33 PM
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It makes the bike turn in easier/faster along with the 190/55 tire.
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post #8 of 17 (permalink) Old 06-12-2010, 09:45 PM
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Thanks bro I will look into doing the same as I run a 190 as well.
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post #9 of 17 (permalink) Old 06-13-2010, 12:46 AM
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Quote:
Originally Posted by Hawkdriver View Post
If you don't mind me asking what advantages did you get out of lowering the front and raising the back end. Just curious if its something I should do to mine.
Lowering the front end and/or raising the back end slightly reduces the rake and trail. That makes the bike turn quicker.
It also makes the bike a bit more unstable due to less trail (or caster in car terms).
Don't go crazy with these adjustments. Make small adjustments and test.

Another way is the add a shim to the rear shock mount.
You can change the thickness of the shim to vary the ride height change.
You can also do likewise by changing out the lower shock link with the Kyle Racing lower link.

Also remember that not only does the 190/55 have a more ogival (pointed) profile over the more evenly round 190/50, but the 190/55 also is a taller tire by a few millimeters.
This too will effectively change the rake/trail by a small degree.

Plus, tires heights vary from the manufacturer for the same "size" tire.
Each time I've change brands, I've measured the circumference and the overall height can be different for front and rear depending on brand/model of tire.

For instance the 120/70-17 Conti RaceAttack Street is 296.6mm radius and the rear is 323.9mm.
The Dunlop Sportmax Q2 120/70-17 is 301.6mm radius and the 190/55-17 rear is 321mm.
So just switching from Continental to Dunlop caused a 5mm raising of the front end and a 2.9mm drop in the rear for an effective change of 7.9mm.
It doesn't sound like much, but it will affect your handling.
That's why it's recommended to measure your tires when you change brands.
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post #10 of 17 (permalink) Old 06-13-2010, 01:16 AM
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Wow I have been riding this thing since 04 and didn't know any of that. Thanks for the info. Very good to know.
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