650b wheel radiis/diameter ?

[1spd1way]

I need a baseline to determine if an investment is warrented. Can someone measure their rear wheel for me?

[Cracked Headtube]

Manufacturer states about 703mm for NeoMoto 2.3. You'll see the same number from a knobby 700x43c or a 26x2.6"

[MMcG]

I did a quick rough measurement this a.m. and got around 27.7" - again this was very rough and quick with the wheel still on my bike. Blunt rim paired up to a 2.2 Wolverine.

Not scientific at all but a rough number for you to work off of if it is helpful.

[derby]

Comparing rim bead seat diameters. From Measuring Bicycle Rim Sizes

622 mm 29'er
584 mm 650b
559 mm 26'ers

650b rims are 25mm larger, nearly 1 inch.

On average you need 1/2 inch more fork and frame stay radial clearance for 650b over a 26 inch wheel with tire. Tire heights vary for any width. In other words a 2.2 wide tire of one model may have a different overall tire height above the rim than a different model, even within the same manufacturer.

[JMac47]

Yeah just like it varies in size for different 26 & 29" models. These "can someone measure their tire to see if one will virtually fit my frame" over the internet.

Rims play a big part too! I have a pair of 2.1 Neos, one mounted on an Alex XD Lite and the other on a Laser Disc Trail back wheel. One had +5mm clearence on the stay braces, the other scrubbed them. The Nevs were pretty consistant. Not dissn the Pacenti at all just haven't mounted my Wolv to a rr wheel yet to see if they vary.

[craigsj]

Rims play a big part too! I have a pair of 2.1 Neos, one mounted on an Alex XD Lite and the other on a Laser Disc Trail back wheel. One had +5mm clearence on the stay braces, the other scrubbed them.

Rims play a big part in tire width. The difference in height in your example should be about 1mm, not over 5mm.

http://forums.mtbr.com/wheels-tires/...th-756818.html

[JMac47]

Rims play a big part in tire width. The difference in height in your example should be about 1mm, not over 5mm.

http://forums.mtbr.com/wheels-tires/...th-756818.html

Being of the Engineer backround you seem to have most all the answers. So what's 5mm in say "Carpenter" speak, 1/4"? Since that's what it is/was.

Anyway I was speaking more of noticing a variable in circumfrence/diameter/radius in same size tires from same manufacturers not so much in rim differences, which I doubt the two are too much different in configuration.

[1spd1way]

Thanks for the info everyone.
I had "Duh, what a Dufus I am" moment.

How many times have I seen 27.5? God, how dull have I been lately!

[MMcG]

What are you trying to convert anyway 1spd1way?

[craigsj]

Anyway I was speaking more of noticing a variable in circumfrence/diameter/radius in same size tires from same manufacturers not so much in rim differences, which I doubt the two are too much different in configuration.

That sounds right.

[JMac47]

That sounds right.

Whaaaaa.....without any icons I can't tell if you're really agreeing or what. But thanks anyway. Does this mean you're going to lighten up on us 650B geeks?

[1spd1way]

I have two Cannondale superV frames. Circa 1995 or 98. One frame I'm building into an uberV. Longer travel, Jeckyl swing arm. The other I just picked up, elevated swing arm (alum not carbon).
LBS says I'm a sucker for old bikes.....

[1spd1way]

Does a Mani sherman fit a 650b? I think a camo version would be killer on the uber!

[MMcG]

I have a 2001 Jekyll in my garage right now. It is a Jekyll 900 I believe - the one with the Volvo team color paint scheme. It was donated to a group I'm involved in called CTBikeshare. There's no chance that a 650b rear wheel/tire combo is going to fit on this 2001 era rear end.

[1spd1way]

MMcG, that's funny. I stripped a vovlo crackanfail for the lefty and the swing arm.
Bummer on the no-go rear swing arm. I may still have a lefty 650 wheel built.