taff_d Posted July 29, 2012 Report Share Posted July 29, 2012 Anyone changed the rear sprocket ? I have been told that aftermarket 4 bolt sprockets need some sort of machining to fit ? what needs to be done ? Also anyone know if a 44 rear sprocket will fit onto a std chain ? Quote Link to comment Share on other sites More sharing options...
deonattard Posted July 30, 2012 Report Share Posted July 30, 2012 I think S3 have a compatible sprocket in their catalogue. We've put a 10T front sprocket onto Dad's bike - I prefer the standard gearing myself but he likes it lower so he doesn't have to ride the clutch so much. Quote Link to comment Share on other sites More sharing options...
taff_d Posted July 31, 2012 Author Report Share Posted July 31, 2012 is there a big difference from a 11 to a 10 when comparing bikes ? Quote Link to comment Share on other sites More sharing options...
deonattard Posted August 1, 2012 Report Share Posted August 1, 2012 Yes there is - the one tooth at the front is something like 9% reduction in the gearing. Dad prefers it because the motor is revving more, the bike is harder to stall so he doesn't have to be so quick on the clutch. He can ride it through some sections without covering the clutch, whereas I have one finger on the clutch all the time. Dad still seemed to get up all the big stuff last weekend without going into 2nd gear, bike was just revving a little harder. I prefer the standard gearing myself but Dad is a lot happier with it geared lower. I was a bit worried that the lower gearing might make it a bit angry and agressive to ride but thats not the case, the power delivery is still very smooth and not agressive. The front sprocket I think is the same as a late model Gas Gas. They have them here: http://trialstribulations.net/index.php?main_page=product_info&cPath=24_16_75&products_id=442 Quote Link to comment Share on other sites More sharing options...
taff_d Posted August 1, 2012 Author Report Share Posted August 1, 2012 (edited) Sussed this myself now, Ossa been Ossa use a 8mm bolt with a 10mm location shoulder to fasten the rear sprocket on to the hub, so you cant use the standard Ossa bolts with other sprockets as they only have 8mm holes in them also the head on the Ossa bolt is bigger than normal and does not fit in the counterbore on after market sprockets. I have fitted a Talon 41 rear sprocket using good quality SS dome heads and locknuts with a 10 tooth front sprocket, this gives the equivalent of 3 extra on the rear over standard. Edited August 1, 2012 by taff_d Quote Link to comment Share on other sites More sharing options...
deonattard Posted August 2, 2012 Report Share Posted August 2, 2012 I saw some Jitsie sprockets advertised for Ossa - would they bolt straight up I wonder?? Quote Link to comment Share on other sites More sharing options...
taff_d Posted August 2, 2012 Author Report Share Posted August 2, 2012 (edited) I've seen them myself but they where mail order they would fit with the std bolts know doubt. More expensive as well ! Edited August 2, 2012 by taff_d Quote Link to comment Share on other sites More sharing options...
deonattard Posted August 3, 2012 Report Share Posted August 3, 2012 Cambridge Trial Centre had them on ebay, I thought the price was alright but they don't have a shipping option to Australia. Quote Link to comment Share on other sites More sharing options...
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