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  1. #1
    RoadBikeReview Member
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    27 inch conversions

    Hey there. I have a line on a Miele Alizee on CL that looks in good shape. Seller says that it comes with 27 inch wheels. I'm wondering if it would be relatively pain free to replace the 27 inch wheels with 650b wheels when they wear out since the 27 inch standard seems to have gone the way of the Dodo.

  2. #2
    RoadBikeReview Member
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    27" is actually slightly larger than 700c. The question is can you get brakes with long enough arms to go 650B? Maybe. Can you get them for 700c? Very likely. The reason to go 650b would be to run monster tires. With the drop from 27 to 700, you will likely be able to run 28 or 32mm 700c tires.

  3. #3
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    The best way to find out if those 650's will fit is simply either find someone who has that size of rim and put them on, or get an LBS to try a set. Or you will need 23 mm of brake pad drop so simply measure from where their at now down to the bottom of the slot to find out if your current brakes are up to the conversion. Also if you have cantilever brakes those won't work without relocating the brake bosses.

    But the bigger question is why do you want to switch to 650? There are actually still somewhat of a selection of tires available for that size, I have a bike that is a 27" touring bike and I when I needed tires I was pleasantly surprised. Since I was going to use it for touring I found that Panaracer Pasela and Pasela TG all came in 27 so I went with the TG and their fantastic tires at a low cost, and as an added bonus they came with tan sidewalls for that original vintage look. But I could have also gotten a set of Schwalbe Marathons if I wanted the ultimate touring tire. I also found that Continental Gatorskins, Hardshells, Supersports, and Ultrasport as well as a few others all come in that size if you want a more road looking tire with a smooth thread design.

    If you're trying to fit fatter tires in the frame then going from 27 1 1/4 to 650 will allow you to put a 38b tire in there and still have room for fenders, but keep in mind the bike will be about 13mm lower so make sure your crankarms won't present a clearance problem when cornering, if they do present a problem you'll need to get the next size shorter arms.

    Then you have the potential problem of brake arm reach; when I converted one of my bikes from 27 to 700 I had to bottom out the brake pads to make it work and that was with medium reach calipers, if you have short or medium reach more then likely the pads won't reach and you will need to find a set of long reach calipers which are around 73mm in reach. There use to be an adapter you could put on short reach brakes to make them longer, but I haven't seen those in so long I forgot what their called, maybe someone here can come up with it.

    I hope I didn't miss anything and got it right.
    http://www.youtube.com/watch?v=xk98yvozq1g
    http://www.youtube.com/watch?v=nvk63...eature=related
    http://www.youtube.com/watch?feature...&v=p92Stnnigjs
    "They don't do things that way anymore. This is the Age of Science Know-How, electronal marvels."

  4. #4
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    You're confused, dirttorpedo. 650B makes no sense. It's 23mm (almost an inch) smaller in radius than 27". (650A are a little larger) 700C (standard road size) is only 4mm smaller than 27". Many brakes have enough adjustment to accomodate that, and if the existing ones don't, longer reach brakes are easy to find.

    But as froze said, there are still good 27" tires available, though obviously not the selection you get with 700C. If the wheels are in good shape, I'd keep them.

  5. #5
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    Thanks guys - you're right. I was completely mixed up on where the "27 inch" wheel sat relative to the 700c, 29er, 650b and 26in mountain bike wheel standards. The bike is gone so its not an issue any longer. I've saw an old Fiori ATB from the mid 80's on CL and was toying with the idea of getting it and converting it to a porteur style bike and using it as a commuter & all rounder. Maybe converting it to 650b over time when the wheels wore out / or I felt the need to try out that wheel size to see if they really are magic.

  6. #6
    RoadBikeReview Member
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    Quote Originally Posted by dirttorpedo View Post
    Thanks guys - you're right. I was completely mixed up on where the "27 inch" wheel sat relative to the 700c, 29er, 650b and 26in mountain bike wheel standards. The bike is gone so its not an issue any longer. I've saw an old Fiori ATB from the mid 80's on CL and was toying with the idea of getting it and converting it to a porteur style bike and using it as a commuter & all rounder. Maybe converting it to 650b over time when the wheels wore out / or I felt the need to try out that wheel size to see if they really are magic.
    There is no magic wheel size. Read this about the effects of different wheel sizes: Wheel Size Considerations | Fit Werx: Road Bike and Triathlon Bike Fitting Specialists
    http://www.youtube.com/watch?v=xk98yvozq1g
    http://www.youtube.com/watch?v=nvk63...eature=related
    http://www.youtube.com/watch?feature...&v=p92Stnnigjs
    "They don't do things that way anymore. This is the Age of Science Know-How, electronal marvels."

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