mik60ish Posted June 24, 2010 Report Share Posted June 24, 2010 I have a 07 TXT Pro 125 with 9 x 48 x 520 at the moment. I have been trying to get a 9 x 52 x 520 from Talon Eng which is on back order. Would I be better of going with the 420 conversion? Has anyone tried the 420 conversion from shirtyhttp://www.trialendurodirect.com/products.php?RENTHAL__420__CHAIN_CONVERSION__648&manufacturers=7 as I believe it would be 11 front and 58 rear? Would the 58 rear look too big! and cumbersome I guess I would also need a smaller chain block? Quote Link to comment Share on other sites More sharing options...
copemech Posted June 25, 2010 Report Share Posted June 25, 2010 I have a 07 TXT Pro 125 with 9 x 48 x 520 at the moment. I have been trying to get a 9 x 52 x 520 from Talon Eng which is on back order. Would I be better of going with the 420 conversion? Has anyone tried the 420 conversion from shirtyhttp://www.trialendurodirect.com/products.php?RENTHAL__420__CHAIN_CONVERSION__648&manufacturers=7 as I believe it would be 11 front and 58 rear? Would the 58 rear look too big! and cumbersome I guess I would also need a smaller chain block? You kinda just do the math on all that, as it is all relative. A 9-48(actually 48/9) combo gives you a 5.33 overall ratio. A 9-52 gives you a 5.77 ratio (slower bike speed per revs) Although a smaller chain, and different teeth count, the relative size to the sprockets are similar and ratios still relative, yet a 11-58 set yeilds a ratio of 5.27, whis is a slightly lower ratio number(faster gearing) than the stocker. Lower final drive ratio, faster speed per rev. The front must rotate 5.27 times to get one rev out the rear! Seems opposite your intention. An 11-62 ratio with the smaller chain would give a 5.63 ratio, just in between the others. Quote Link to comment Share on other sites More sharing options...
mikee Posted June 25, 2010 Report Share Posted June 25, 2010 i looked into this with the 225 and from what kev hippwell told me,,,it works out the same as 9 x 48 for the 125cc and 9x42 for the 225cc... I think for the 125cc it would be worth it as there is less drag and this would give a little more help with stalling the bike at low revs.. It will also pickup quicker from a stand still.. I never went with it on the 225 as there was a load of prower from the motor away.. Good luck with it... Quote Link to comment Share on other sites More sharing options...
faktree Posted June 26, 2010 Report Share Posted June 26, 2010 i looked into this with the 225 and from what kev hippwell told me,,,it works out the same as 9 x 48 for the 125ccand 9x42 for the 225cc... I think for the 125cc it would be worth it as there is less drag and this would give a little more help with stalling the bike at low revs.. It will also pickup quicker from a stand still.. I never went with it on the 225 as there was a load of prower from the motor away.. Good luck with it... "MIKEE"...there is only one "p" in Hipwell. and he sent me the exact same e-mail to work... Quote Link to comment Share on other sites More sharing options...
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