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BBS02 on a Trek Roscoe 8

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    BBS02 on a Trek Roscoe 8

    The chain stay wouldn't allow a BBSHD so I did an 02 and couldn't be happier! The mini cube battery is temporary as I plan to add a triangle battery, once I decide on a decent mount as I don't want to use a bag. I removed the dropper post in lieu of a Thudbuster, which has made a nice difference.

    #2
    Nice looking build.

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      #3
      I'll bet the suspension seatpost makes a big difference, it doesn't take long to figure out the faster you're traveling the more impact road cracks, driveway curbs and potholes have.

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        #4
        I’ve ridden a few trails this week and this setup is surpassing my expectations. I attribute the torque I’m getting to the 30t chainring. The seatpost is saving my butt for sure.

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          #5
          Excellent build! How's your chain line with the 30T? Do you have an overhead picture? I found the Lekkie 42T gave a wonderful chain line and seemed adequate for climbing with a 34T low rear ring, but 42-44T in 1st out back would probably be even better and you wouldn't have to climb so fast.
          2018 Surly ECR 5spd IGH 29+: https://electricbike.com/forum/forum...id-drive-build
          2013 Niner Jet 9: https://electricbike.com/forum/forum...lectric-assist
          2016 Soma B-Side Belt Drive 3spd IGH: https://electricbike.com/forum/forum...v-custom-build

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            #6

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              #7
              I have a Trek Roscoe 6 and also put a BBS02 on and can confirm that it barely fits so the BBSHD will not fit as the rear frame bends to accommodate the wider tire. Also Trek has a very small front chain ring at 28 teeth. I ordered mine with a 42 tooth Lekkie but that would not fit even with spacers behind it. So I installed a Lekkie 36 tooth ring. The chain line is still out far so set my derailleur limit to stop me using the 2 lowest gears. So far so good.

              The only other issue is that the locknut comes loose as the lock ring does not fit. The Luna Wrench is pretty useless at getting the nut tight, (best to order the socket). The nut was not tight enough and ended pressing against the derailleur cable making for poor shifting as the cable come out through the frame right where the motor sits. I ended up putting a piece of rubber between the motor and frame and also used blue lock tight on the nut and using a hammer to get it tight.

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                #8

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