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Specialized Demo 8 BBSHD

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    Specialized Demo 8 BBSHD

    Here are a few photos of my Demo8 BBSHD DH bike. In the photos I am running a lekkie 36 with an 11-25 cassette, the chain line is pretty bad on the low ratio gear so I have since swapped to a lekkie 42 which has a better chain line offset, and gone with an 11-36 cassette giving a perfect chain line and better low gearing for uphill climbs.
    The BB on these bikes are a PF30, 83mm width. I used an eccentric bb to get a better clearance between the axle and bb shell, this allowed me to rotate the BBSHD further foreward getting better ground clearance.
    BBSHD is 100mm width.
    I have noticed with the extra width of the bb, the pedals are sitting quite a bit further out from the bike centre and I have found that I am getting pedal strike quite often. Im pretty sure I will get used to this and adjust my riding to account for it. I am running 170mm lekkie cranks, not sure if there are options for shorter cranks that fit the BBSHD.
    I am running a luna 17.5 ah battery in a backpack, which seems to be going well. I have set everything up so I can switch to another bike If this one doesnt work out. So far it seems really good though.
    I will be using it for a combination of riding:
    1, local tracks i can ride to from my house where there is an access road to the top of trail heads (no public driving access) then single track grade 2-5 downhill only trails
    2, general exploring on cross country trails/farm access tracks/coastal tracks
    3, going to my mates place to brew beer where we have one or two beers so dont want to drive the car.
    There is a possibility of getting a trailer to tow the kids around on camping trips etc too.
    Hopefully this info helps anyone else looking into converting a downhill bike into an electric bike using a BBSHD.

    Stew


    #2
    how fast can you get that Demo 8 up to?

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      #3
      Around 40 kph on the road. Could go faster if the front chainring was bigger but I want to be able to climb hills so need some low ratios.

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