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  1. #1
    mtbr member
    Join Date
    Dec 2017

    Cranks for DB Atroz 2017

    Hi All,

    by replacing the BB, I damaged the crankset on my BD Atroz 1x9. Now I have to replace it too. The problem is I am not sure what will fit.

    The BB was square taper, no-name, 73x113. Replaced it with SHIMANO BB-UN55 Square taper Bottom Bracket 73x113.

    The original crankset appears to be Lasco, FM682R G-1 175 (that's all written on them)

    Bought SHIMANO M361 Hybrid Crankset (Black, 175mm X 42/32/22T)

    Also decided to replace the chainring with CYSKY Narrow Wide Chainring 104BCD 32T 4 Bolts Bike Single Chainring for 9 10 11 (original was 32T, no name)

    After removing the rings from Shimano M361, and replacing it with Narrow-Wide, trying to install and it does not fit properly. First of all, it goes way too much inside the BB, to the point that it touches the frame (with the 4 parts where the small chainring was attached). Even if I shave out the 4 pins into which the small chainring was attached to, still i have the filling that there is too much play between BB axel and the crankset and it goes too deep into axel. I measured the square diameter on the new crackset and old one and the new one is slightly larger; which does not make sense to me.

    Please help with what crankset would fit properly for this 1x setup.


    1st: on the left the new Shimano crankset, right the old one

    2nd: original crankset on the bike.
    Attached Thumbnails Attached Thumbnails Cranks for DB Atroz 2017-img_2387_web1.jpg  

    Cranks for DB Atroz 2017-img_3712_web1.jpg  

  2. #2
    mtbr member
    Join Date
    Dec 2017
    after several days of investigation and reading the forums I am still at lost.
    Any direction I should pursue would be of great help.
    My thoughts for now:
    1) while the original BB was 113, seems it is probably too short for Shimano cranks I bought. Would replacing it by 73x118 solve the problem?
    2) Looking for different crankset, but have no idea which one would fit the current BB Shimano UN 55 73x113. The old one fits it well, btw.
    3) Maybe give up on square taper and move to something else? I am wiling to do that too, knowing what to order.

    Found additional Info on the Shimano FC M361 that I bought; according to JensonUSA:

    Shimano Acera 7/8 Speed Crankset features many of Shimano's features that can also be seen on higher end components. The patented Hyperdrive system will provide quiet, easy and trouble free shifting. Available in two arm lengths and two gearing options. Choose the 22/32/42 option for standard mountain bike use and the 28/38/48 for taller road like/touring gears. Also available with a chain guard.

    Rings: 22/32/42 or 28/38/48
    Spindle Interface Type: Square Taper JIS
    Spindle Length: 122.5 mm
    Crank Arm Length: 170mm or 175mm
    Chainring BCD: 104/64
    Bolt Pattern: 4-Bolt
    Chain Compatibility: 7/8-Speed
    Pedal Spindle: 9/16"
    Color: Black
    Crank Intended Use: Mountain

    Question: Does this mean that if I replace the BB with SHIMANO BB-UN55 Square taper Bottom Bracket UN55 73x122.5 it will work out fine?

    Some additional measurements: the distance from the frame to the to the chain guide roller is approximately 10-11mm.

    Any advise will be really appreciate, since I got lost in all these specs.
    Last edited by Recentia; 12-26-2018 at 06:39 PM. Reason: updates

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