a little bit of a fix- Mtbr.com
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  1. #1
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    New question here. a little bit of a fix

    I recently came into possesion of a fairly unique bike. it is a custom built reynolds 725
    frame with horizontal dropouts. Heres the odd part, the spacing of the dropouts is 120mm, track spacing. I built up a rhyno lits on a track hub and currently use the bike as a commuter. now for the questions: Does anyone know about the durability of this metal and whether or not it could be used as an offroad single speed? i went to the reynolds site and found out that 725 was formerly known as "heat treated chromoly" (http://www.reynoldsusa.com/internet/...teel/steel.htm). if it is determined that it is possible to ride off road, i was wondering how to build up a rear wheel with a more thrash-friendly hub. Is it possible to build up a bmx hub and then add a longer axle and spacers? This would be my third single speed so i dont want it to be an expensive project (it would be more of a loaner for those dipping their toes into the pond we call singlespeeding)
    thanks y'all

  2. #2
    formerly ss-nyc
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    Use BMX hubs

    I use a 110mm spaced rear Shimano BMX single speed casette hub "re-spaced" to 135mm. It was very easy since this hub uses standard 9.5mm axles. All you need is a longer axle and some spacers.

    https://www.bikecult.com/works/archi.../vdsCRBZdo.jpg


    Quote Originally Posted by dompedro3
    I recently came into possesion of a fairly unique bike. it is a custom built reynolds 725
    frame with horizontal dropouts. Heres the odd part, the spacing of the dropouts is 120mm, track spacing. I built up a rhyno lits on a track hub and currently use the bike as a commuter. now for the questions: Does anyone know about the durability of this metal and whether or not it could be used as an offroad single speed? i went to the reynolds site and found out that 725 was formerly known as "heat treated chromoly" (https://www.reynoldsusa.com/internet...teel/steel.htm). if it is determined that it is possible to ride off road, i was wondering how to build up a rear wheel with a more thrash-friendly hub. Is it possible to build up a bmx hub and then add a longer axle and spacers? This would be my third single speed so i dont want it to be an expensive project (it would be more of a loaner for those dipping their toes into the pond we call singlespeeding)
    thanks y'all
    Attached Images Attached Images

  3. #3
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    Quote Originally Posted by NYCfixie
    I use a 110mm spaced rear Shimano BMX single speed casette hub "re-spaced" to 135mm. It was very easy since this hub uses standard 9.5mm axles. All you need is a longer axle and some spacers.
    Where did you get your axle and spacers and how much? I was thinking about doing the same to a DX hub like yours.

  4. #4
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    That should be a plenty strong frame for off road use. Try riding it fixed on your trails. Shoot for a 2:1 ratio with a minimum of 16t on the rear cog, 18t would be better. Off road fixed riding is a blast!

    bob

  5. #5
    formerly ss-nyc
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    BikeWorks NYC

    Dave Perry Owner/Mechanic of BikeWorks NYC did it for me. As far as I know it is a standard 9.5mm solid axle from QBP (BMX hubs use 9.5mm or 14mm front and back, most other bikes use 9mm front and 10mm back). He used a 174mm length axle on my DX hubs. The spacers probably came from QBP too.

    Axle:
    http://aebike.com/site/page.cfm?PageID=30&SKU=HU8256

    Spacers:
    http://aebike.com/site/page.cfm?PageID=30&Category=1774


    Basically, if you own a fixed gear bike or single-speed in NYC, you have heard of Dave's shop and/or been there.

    BikeWorks:
    http://www.bikecult.com/works/

    Quote Originally Posted by motomc
    Where did you get your axle and spacers and how much? I was thinking about doing the same to a DX hub like yours.

  6. #6
    Penis Goat!
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    Quote Originally Posted by motomc
    Where did you get your axle and spacers and how much? I was thinking about doing the same to a DX hub like yours.
    I've done the opposite on a couple of wheels, making them smaller to fit 126mm dropouts. When taking out the big spacers, however, I had to put some thinner ones in, and remembered some washers I had sitting in my apartment I'd used as crank bolt spacers. They're just ordinary washers from Lowe's.

    I bought an axle at my LBS, and with those washers, it worked perfectly. Your LBS might have some larger spacers also, around 8-10mm. But the washers work great for getting just the right amount. Good luck!

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