Trials Bike Sprocket Sizes and Chain Length

Use the table below to find the size of sprockets and length of chain that your bike uses.

Bike Year Front Rear Links
Beta        
Rev 3 250, 270 2000 to 2008 11 41 100
Rev 3 200 2000 to 2008 11 42 101
Rev 3 125 2007 to 2008 9 43 104
Evo 250, 290, 300 2009 to 2014 11 41 100
Evo 300 2014 on 10 42 100
Evo 250 2015 on 10 42 100
Evo 200 2009 on 11 42 101
Evo 125 2009 on 9 43 101
         
GasGas Pro        
250, 280, 300 2002 to 2018 11 42 102
200 2002 to 2018 10 42 102
125 2002 to 2012 9 44 102
125 2013 to 2022 9 48 104
250, 280, 300 2019 to 2022 10 39 100
         
Montesa        
315 1997 to 2004 10 40 100
4RT 2005 on 10 41 100
         
Scorpa        
SY 2002 to 2009 10 38 100
SR and Twenty 250, 280 2014-2016 10 42 100
SR and Twenty 125 2014-2016 9 48 103
SC 250, 300 2017 to 2019 9 44 101
SC 125 2017 to 2019 9 56 107
SC 250, 300 2020 to 2022 9 42 100
         
Sherco        
200, 250, 290, 320 2002 to 2006 10 42 101
125 2002 to 2006 9 44 101
200, 250, 290, 300, 320 2007 to 2016 10 42 100
125 2007 to 2011 9 48 103
250, 300 2017 to 2019 9 44 101
125 2017 to 2019 9 56 107
250, 300 2020 to 2022 9 42 100
         
TRS        
250,280,300 2016 on 10 40 100
125 2018 on 9 48 104
         
Vertigo        
All Models 2016 on 10 42 103
BetaChainGas gasMontesaScorpaShercoSprocketsTrsVertigo

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