Joshuaawrightt Posted December 11, 2013 Report Share Posted December 11, 2013 Hello, I'm new to trials and don't have a clue what size sprocket to have on front and rear? Please could someone help? Many thanks, Josh Quote Link to comment Share on other sites More sharing options...
trialsiain Posted December 11, 2013 Report Share Posted December 11, 2013 What sort of bike do you have ? if its a pure trials bike with no seat, usually its 20"- 18T front, 12T rear 24"- 18T front, 14T rear 26" 18T front,15T rear Quote Link to comment Share on other sites More sharing options...
Joshuaawrightt Posted December 11, 2013 Author Report Share Posted December 11, 2013 It's on onza bird. I don't think it's anywhere near them sizes Thank you Quote Link to comment Share on other sites More sharing options...
Dazza1414 Posted December 11, 2013 Report Share Posted December 11, 2013 On 12/11/2013 at 1:11 PM, trialsiain said: What sort of bike do you have ? if its a pure trials bike with no seat, usually its 20"- 18T front, 12T rear 24"- 18T front, 14T rear 26" 18T front,15T rear So what would be the ideal rear sprocket for a 24" and a 26" seated trials bike if a 18t front is being used? Quote Link to comment Share on other sites More sharing options...
trialsiain Posted December 11, 2013 Report Share Posted December 11, 2013 On 12/11/2013 at 4:34 PM, Joshuaawrightt said: It's on onza bird. I don't think it's anywhere near them sizes Thank you Oh right they are different ratios as standard, check out the description on here http://www.tartybikes.co.uk/20_inch_trials_bikes/onza_bird_2013/c10p11939.html Quote Link to comment Share on other sites More sharing options...
Joshuaawrightt Posted December 11, 2013 Author Report Share Posted December 11, 2013 It's running 24-16 Would it matter if I changed it to 18-12? What's the pros and cons? And what freewheel is right for this bike? Many thanks Josh Quote Link to comment Share on other sites More sharing options...
Bint Posted December 18, 2013 Report Share Posted December 18, 2013 Your best bet is 18:12 on a mod or 18:13 if you find 12t on the rear too hard, the majority of mod riders use 18:12. You can use any freewheel, if you're just starting out I'd go with a Tensile, cheap and relatively good for the price, get an 18t freewheel up front and a fixed 12t sprocket on the rear. Not sure on your cranks but you might have to buy new cranks with a thread instead of a bolt on sprocket which the old T-Birds used to come with. 1 Quote Link to comment Share on other sites More sharing options...
dezmtber Posted December 18, 2013 Report Share Posted December 18, 2013 I sure old t birds came 22-16. a cheap way would be get that 16 changed over for a good quality 18 freewheel Quote Link to comment Share on other sites More sharing options...
butterztrials123 Posted December 18, 2013 Report Share Posted December 18, 2013 I did it to my onza bird I think it was worth it Quote Link to comment Share on other sites More sharing options...
trialsbikingnunn Posted December 22, 2013 Report Share Posted December 22, 2013 you will need to change the cranks on the bird to run front freewheel, any cranks with a thread on them will do Quote Link to comment Share on other sites More sharing options...
butterztrials123 Posted December 24, 2013 Report Share Posted December 24, 2013 I didn't need to change cranks, all yeah need is 18 freewheel, a freewheel tool(or hammer and nail whichever you prefer), 12 sprocket ands that's it. Quote Link to comment Share on other sites More sharing options...
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