You can fit 650B wheels on any 700C bike. The question is which brakes to
use. The Sam uses sidepull brakes. Ask Riv what the reach is for a 650B
rim on a 56 Sam. Silver sidepulls reach to 75mm; Dia Compe/Weinmann
centerpulls reach to 78mm. If the reach is more than that, then you may be
out of luck. Well, there are BMX sidepulls that reach further, but I don't
know how effective they are on larger, 650B rims.
If your Sam uses cantilever brakes, then I think you're stuck with the
wheel size they're mounted for.
The question is, what would you gain with 650B? You can already fit 45mm
tires on 700C rims on the Sam. Do you want more float than that? If you
do, then go for it.
I converted my Riv Road to 650B and love it. But I was limited to 28mm
tires on 700C rims, and much prefer the 38mm Lierres. I may even try some
light knobbies for gravel ("27.5er" MTB tires are getting more available).
And it's pretty easy to swap back and forth between my 700C and 650B
wheels; just swap brake calipers along with the wheels.
Tim
On Wed, Aug 7, 2013 at 6:20 AM, Mitch Browne <mitch.bro...@gmail.com> wrote:
> I've ridden Supreme 40's under my Atlantis Longboards daily for almost two
> years now. Love them. No fit issues.
>
> Mitch Browne
> San Luis Obispo, CA
>
>
> On Tuesday, August 6, 2013 4:46:53 PM UTC-7, Mark Taintor wrote:
>>
>> I have a new 56 cm Sam that's going to be built up in the next week or
>> so, and I've got a couple questions about tires and wheels for it:
>>
>> 1. I'll be putting on Longboard fenders and was wondering if 40 mm
>> Marathon Supremes would work with them. Would it be better to run the 35 mm
>> Supremes? I know there's clearance for 40 mm tires on the Hillborne but
>> don't know if that is with/without fenders.
>>
>> 2. Anybody ever put 650B wheels on a 56 Sam? Looking on the Riv website
>> at the page for the Betty Foy, it says that the Betty and the Sam can take
>> the same volume tires. The Betty mostly uses 650B wheels. As of now I'm
>> planning on 700c wheels, but am intrigued with 650B. Thoughts?
>>
>> Thanks,
>> Mark
>>
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