5.5" wheel on a 51 - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 11 (permalink) Old 09-17-2015, 10:10 PM Thread Starter
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5.5" wheel on a 51

I have a sneaking suspicion that my rear 5.5" bst on my 600rr will actually go onto my 51 with essentially no effort at all, so far as I know the only real difference is the thickness of the rear brake caliper hanger that picks up the difference in swingarm width. now obviously I'd have to see but I know for a fact lots of guys use the 6" rears on their 600rrs.


the big question is, has anyone actually ridden a 51 with a 180 rear tire? is it really that bad? it's not like this bike makes a boat load of power and I'm not about to race the living crap out of it.


so.... good idea? meh idea? you're a complete retard idea?
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post #2 of 11 (permalink) Old 09-17-2015, 10:28 PM
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It's a personal decision for your build and if/where you want to compromise.

It will work if it fits, though many wouldn't make such compromises on a high end build, or even a mid level build, even if it is a relatively small compromise.
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post #3 of 11 (permalink) Old 09-17-2015, 10:30 PM Thread Starter
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I was more thinking of it as a "for now" compromise, not a forever.

just curious if anyone had any feedback from doing it themselves.
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post #4 of 11 (permalink) Old 09-18-2015, 12:38 PM
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I spent years running a 180/55 tire on an RC51 on 6" rims. Did the same thing on my 1000RR at certain tracks to get the bike to steer quicker through fast transitions than it did with a 190/55 tire

Never tried the 5.5" rim specifically, but if anything the 180/55 tire would likely be a better profile on the smaller width rim.

For the record I used to use a 170 tire on my 900RR for similar agility issues specifically on the track. It just steered better. Even though you get less contact patch at full lean angle with a smaller tire their are other benefits to weigh out like rotational mass and profile to make it change directions quicker. Plus how many of us are really putting the spurs to your bikes while still at full lean angle?
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post #5 of 11 (permalink) Old 09-18-2015, 01:01 PM
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I would imagine the crown of the tire would be a smaller radius mounted on a narrower rim and probably steer even better.
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post #6 of 11 (permalink) Old 09-18-2015, 02:04 PM Thread Starter
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Wing and LDH, that's what I'm thinking too. I currently have a 180/60 pirelli sc v2 on the wheel and am loving it. I suspect I'll mount it to the 51, it could certainly benefit from the taller tire and quicker turning


I remember running 180/55s on my 51 and the only thing i remember is getting to the edge of them pretty quick. A 180/60 on a 5.5 will have acres of sidewall to use.

I'll give it a go, why not
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post #7 of 11 (permalink) Old 09-18-2015, 05:24 PM
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I been doing just that for a few years. 5.5 bst on the rear of the 00 rc51 specfic and 5.5 marchesini cbr 04-05 wheel with correct spacers/ cush drive bought from mike. 180/55 s20 loving it. Ohlins on both, but have the 30mm drop in on the 02. I never knew the US to lay down so much railroad tracks. My hugger goes all the way through the swingarm opening. The 190/55 ruubbed the hugger. Lookin at the ducati it is running 5.5 on the 848 about the same numbers as far tq/hp. The rc does weigh more but I figure lighter parts the weight numbers are probably close. Thinking the outer rim being smaller helps with spin up and gyro effect. I may be just the village idiot though.
I sold my 6"bst rear after years of use when converting the 00 to 02 swinger. I went from the 6" marchesini after a few road miles and a couple of trackdays to the 5.5". You will be fine.

Last edited by tarmacslider; 09-18-2015 at 05:31 PM.
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post #8 of 11 (permalink) Old 09-18-2015, 05:48 PM Thread Starter
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@tarmacslider

Exactly what I needed to hear! This makes things a LOT easier for me.

Thanks
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post #9 of 11 (permalink) Old 09-18-2015, 07:35 PM
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Yup, as mentioned, obviously it works,..... though as a compromise.

Wow, a 30 mm drop. Do tell.

Last edited by kwtoxman; 09-18-2015 at 07:47 PM.
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post #10 of 11 (permalink) Old 09-18-2015, 07:54 PM Thread Starter
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Quote:
Originally Posted by kwtoxman View Post
Yup, as mentioned, obviously it works,..... though as a compromise.

Wow, a 30 mm drop. Do tell.
I suspect that when he said "30mm drop in" he means he has the ohlins 30mm cartridge kit installed in his 02 forks.

I originally thought he dropped the front end 30mm as well, but that would be ridiculous
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