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  1. #1
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    converting 26" to 650b (27.5")

    I own a Cannondale MT-800 mtn. tandem. It has 26" wheels, mechanical disc and a rigid fork. Has anyone done this conversion to 27.5 yet for a mtn. bike tandem? I'am thinking it might work. Any thoughts?

  2. #2
    rebmeM roineS JanMM's Avatar
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    That's 559 to 584. 25mm. Not much difference. What do you expect to gain?
    Lots more tire choices in 559, at least in the States. With discs, no brake problems with a conversion, of course.
    Last edited by JanMM; 05-08-14 at 06:34 PM.
    RANS V3 (steel), RANS V-Rex, RANS Screamer

  3. #3
    Senior Member waynesulak's Avatar
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    If you are riding on the road then there are lighter weight high volume tires available in 650B.

    The marketing of "27.5" inch and 29" wheels makes little since to me, what measures 27.5 inches and 29" anyway?

    26" actual size (bead seat of rim) 559
    27.5" actual size (bead seat of rim) 584, traditionally called 650B, SMALLER than traditional 27" wheel
    29" actual size (bead seat of rim) 622, traditionally called 700C SMALLER than traditional 27" wheel too
    27" actual size (bead seat of rim) 630 traditionally 27"

  4. #4
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    I'am thinking for gravel, and mtn. events such as the upcoming ore to shore in Mich. I think more climbing ability . 29er wheels seem to big. I think the conversion should work also.

  5. #5
    coprolite fietsbob's Avatar
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    29er uses a 2" tire , but you can dial back tire width and reduce the height at the same time .. same rim ..

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    I think it would work well if you wanted a second wheelset for road riding. A 650b wheel with medium width tire (~40mm) would have a similar diameter to a 26" wheel with a 2" tire. If you fit a larger 650b/27.5" tire (assuming it clears the frame/fork) you will raise the bottom bracket height, which will affect handling somewhat.

  7. #7
    Gear Combo Guru Chris_W's Avatar
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    Quote Originally Posted by waynesulak View Post
    26" actual size (bead seat of rim) 559
    27.5" actual size (bead seat of rim) 584, traditionally called 650B, SMALLER than traditional 27" wheel
    29" actual size (bead seat of rim) 622, traditionally called 700C SMALLER than traditional 27" wheel too
    27" actual size (bead seat of rim) 630 traditionally 27"
    I agree, we should all just use the BSD / ERTRO sizes. Also, you forgot the name '28" wheels', which is what many Europeans call 622 mm rims when they have trekking tires (about 35-40 mm wide) mounted. Names like 700C and 650B are no better than 26" and 29" because they are just rough metric equivalents of the imperial (inch) names, again referring to the external diameter of a theoretical tire.

  8. #8
    PMK
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    It should probably work. Been a bit of discussion about this and even installing 29 forks and the rest of the front end. Most teams did not enjoy 29 vs the effort it seemed.

    As you describe the race, you would be much better off if you could borrow a Fandango. Those bikes have a lot of grip but roll very fast.

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  9. #9
    Hook 'Em Horns
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    The Promax brakes have 30mm of vertical adjustability, they are ideal for 559 to 584 conversions if your current calipers don't work with the new wheel size:

    https://www.danscomp.com/products/48...1_V-brake.html

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