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  1. #1
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    Converting HT 26er to 27.5?

    I've been reading up on converting 26ers to 650b wheel size. I'm curious if anyone has converted there 26 inch wheeled Motobecane to 650b wheel size. I've got a Fantom Trail HT XL frame (22.5in) Save up to 60% off new Mountain Bikes - MTB - 2010 Motobecane Fantom Trail

    From what I've read, I understand it might be doable but not the best idea due to alteration of the geometry. Any input is appreciated!

  2. #2
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    I found this as I was continuing to research and found it very interesting.
    tire comparisons
    Its an older thread from 2011 but it talks and has pictures of different sized tires in 26 inch wheels and 27.5.

    So depending on my rim width, going with a wider or even a fat tire would help me achieve the same goal as converting. Plus the cost is less!

    Any input would still be great! Thanks!

  3. #3
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    Don't bother. Geometry change will be minimal, so I wouldn't worry about it. Challenge is fitting in the tire. You can usually shoe horn a 650 tire into a 26" fork, but you'll have more problems will the rear chain stays. The tire will fit, but you might need to limit the width to 2.0" which is pointless unless your going for a weight weenie build. I'd rather look for wider 26"rims and big 26" tires. 30mm rims and 2.5"tire up front plus a 2.3" or 2.4" in back (basically the widest tire that fits in back)
    "a hundred travel books isn't worth one real trip"

  4. #4
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    Thanks for your response! I'm gonna take your advice and do some bigger tires. That seems to be guaranteed improvement and not messing with the geometry

  5. #5
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    i agree with watts... just curious... how big can 26 in tires go these days ?

  6. #6
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    I've been looking at 2.4's to go on my bike they make them fat. 2.5's, 2.8's, and even 26x3.0

  7. #7
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    Fat tire bikes are just 26" rims. Never going to fit a 5" tire in the moto frame, but you can put them on those skinny rims. They really look funny though.

    2.3" should be fine. 2.4" might be pushing it. Have to add some for mud clearance if you ever ride in mud
    "a hundred travel books isn't worth one real trip"

  8. #8
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    Thanks watts, I am concerned the 2.4 won't fit the rear. I typically ride on rocky/roots and packed dirt. Rarely any mud but thats one thing I didn't consider. Maybe 2.2 or 2.3 rear and 2.4 front? thanks for the response.

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