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    wheel tire sizes

    Just a question about wheel size. I bought a 700c electric conversion kit and it has a ss25 samson rim. the channel is 25 wide and 15.5 high. I want to put a comparable rim size wheel on the rear and use a Continental Comfort Contact Urban Bicycle Tire. What rear wheel should I buy and what is the widest tire I can use on both wheels? Thanks

  2. #2
    rigamortis tortoise LesterOfPuppets's Avatar
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    Those are some really wide rims. I don't see them in 700c, though, just 26".

    The upper limit of tire width you could run will likely be dictated by your bike's frame and/or brakes. Samson recommends 2.125" maximum but I bet you could run 2.4" if you wanted, most of them will be knobby, though.

    Is this kit front wheel drive?
    1980ish Free Spirit Sunbird fixed * 1996 Mongoose IBOC Zero-G * 1995ish Park Pre Pro 825 * 1997 KHS Comp * 1990-ish Scapin * Lemond Buenos Aires Triple

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    response

    Quote Originally Posted by LesterOfPuppets View Post
    Those are some really wide rims. I don't see them in 700c, though, just 26".

    The upper limit of tire width you could run will likely be dictated by your bike's frame and/or brakes. Samson recommends 2.125" maximum but I bet you could run 2.4" if you wanted, most of them will be knobby, though.

    Is this kit front wheel drive?
    the wheel is front wheel conversion. thanks

  4. #4
    Senior Member Jim Kukula's Avatar
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    http://www.schwalbetires.com/tech_in...dimensions#rim

    Schwalbe says you can run 44mm tires up to 62mm. Probably wider but I guess that's the widest Schwalbe makes! That's 2.4 inches.

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    thanks, I'll run something less than that. but i still need to know about the rear wheel. i can't run the skinny back tire or wheel. I might be better off if i removed both original wheels, tubes, and tires with less than 100 miles on them and sell, donate, or trade them. i want to purchase a new rear wheel. it doesn't even need to be a seven speed. a single speed to get me home (would it be a two speed because of the pedal derailer) if/when the battery is used up. thanks, david

  6. #6
    Senior Member Jim Kukula's Avatar
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    If you want a whole new rear wheel then you have to think about the hub too, to get the distance between the dropouts right and chain in the right place. You can run the 42 mm Continentals on a rim that is only 17 mm inner width so maybe you can just keep your rear wheel and save a lot of fuss! If you really want to change wheels then you could always get a wheel built and use that same Samson rim, but yeah you have to watch the brakes and stays to make sure it'll fit with the tires you want. The whole thing is not really a trivial exercise!

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    I think that I'll try a "700 x 35c rear 7sp cassette alloy QR" from huffy sports. i quote exactly from the page i printed out. at $35.00 plus shipping, it's worth looking at. here again, i've heard of a "fixie" which i believe has only one gear. what gear should i get, and perhaps if you look up the wheel, you could make recommendations. ps. this is a project bike. i have a miami tricycle i restored and a 26 inch mountain bike and i drive a 27 year old chevy when things don't fit on the bike. thanks for your help, David

  8. #8
    Senior Member Jim Kukula's Avatar
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    A fixie generally does not have a mechanism to let you coast. The pedals go around when the wheel goes around. You can even pedal backwards and make the bike go backwards. I have never ridden a fixie... got to be interesting!

    Then there are singlespeed bikes. Those you can coast with. But if you have a seven speed derailleur on the bike now, that seven speed Huffy wheel will probably work and if it takes a 35 mm tire you can almost certainly push it a bit wider.

    If you went single speed... the sprocket would depend on the chainring size too. Actually if you have a front derailleur then you pretty much need the rear derailleur too. The rear derailleur has the mechanism to take up the varying length of chain that happens when you switch between larger or smaller chainrings or sprockets.

    One fun game I have heard people play - you can have a "flip flop" hub, with sprockets on both sides. If the sprockets differ in size by the same number of teeth as your chainrings, then you can switch the chain to the larger chainring up front at the same time you switch to the smaller sprocket in back. You could have a two speed fixie that way, without fussing with a varying chain length!

    Endless fun!

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    i think i'll put the new tire on the rear and hope for the best. discontinuity visually, ie. not visually balanced be darned. if it bothers me that much, it really will be a project bike. thanks for your input and best wishes, david

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