richzj Posted June 7, 2009 Report Share Posted June 7, 2009 HI all The bike in question is a Matchless a g3lc trials 1957 ,according to the log book. I'm looking to lower gearing although all ready a trials model still to fast in sections ,gearbox sproket all ready as small as possible i think?Is there a primary sprocket with less teeth? Any help would be very much appreciated. thank you richard Quote Link to comment Share on other sites More sharing options...
trialsoldtimer Posted June 11, 2009 Report Share Posted June 11, 2009 Assuming you have a 14 tooth gearbox sprocket, if you require a 1st gear overall ratio of say 30:1 then calculate what size engine sprocket you need and get one made using the spline from your existing welded to a machined blank. Alternatively. see what Talon Engineering can do for you. Quote Link to comment Share on other sites More sharing options...
richzj Posted June 12, 2009 Author Report Share Posted June 12, 2009 HI thanks for reply I wil now count gearbox sprock teeth ,if 14 I will get engine sprock made Cheers richard Quote Link to comment Share on other sites More sharing options...
matchlessman Posted June 26, 2009 Report Share Posted June 26, 2009 (edited) Rear Sprocket is an easy mod, turn the teeth of fthe brake drum leaving as much meat as possible, then weld on a flange to abut up to it. You can then bolt on any size sprocket (can't go as small as you can with the standard drum). B&C express will make a sporocket to measure, to fit any internal Diameter. Advantage is its quick and simple to change gearing, without stripping down clutch etc (or half the gearbox on my rigid). Edited June 26, 2009 by Matchlessman Quote Link to comment Share on other sites More sharing options...
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