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'70 TR6R final drive gearing

Discussion in 'Triumph (Classic)' started by RoadScholar, Aug 30, 2019.

  1. RoadScholar

    RoadScholar VIP MEMBER

    Dec 28, 2008
    When I rebuilding/restoring this motorcycle I replaced the countershaft and the rear sprockets. I selected the sprockets from the parts book that were identified as the ones it was originally shipped with: 19 counter and 46 rear.

    As this motorcycle is breaking in I have noticed that this gearing is on the (very) short side; I can start from rest in second gear fairly easily.

    After some digging I learned that I can fit a 20 tooth counter without modifying the access port in the primary, but would need to do some grinding to fit a 21.

    I have found that a 43 tooth rear is about the lowest available. I'm thinking about doing the 20---43 gearing, but would really like to hear from members that have experience in this area on a TR6R, 650.

    Any suggestions for good all around gearing for street operation where I can cruise in the 40 to 60 MPH range (light to moderate engine load) with out lugging the engine in 4th gear are appreciated.


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