Good luck, thats like answering one of the questions of the universe, to my no - ledge they dont even make a insturment to measure that, but at the helixchopper shop? probably?? I too have inqiured about this and if you find a way tell me.
Why dont you e-mail them and ask and tell them you are working on clutching your sled and you have one of there helixs but you dont know what it is and you would like to try a diffrent one but
dont know what to get because you dont know what you have now it worked for me i hade one of there helixes a 608 and they told me it was a 50-42 :thumbsup:
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