Paperclip Posted June 25, 2015 Report Share Posted June 25, 2015 My drive setup works on the basis of strong bottom bracket, strong cranks and a beefy chain. At the moment those are all well and good but I can't seem to get a decent 22t sprocket to suit. I have recently moved to BMX cranks and have been finding them pretty fine and was running a Animal sprocket. Nothing has really changed apart from the new Animal sprockets are even more so cnc'd and keep snapping when I am giving them some pasty at moves (just from pedaling hard). At the moment my options seem to be Find a decent 22t sprocket (I have found a profile one from america but he's only got one left so as a long term plan that's not really ideal). move to a different style of cranks but then I can't use my hefty chain as it's too wide for them. Move 25T and run a solid sprocket, always have options to replace it and can also run a bmx halfring bash. The above is sort of irrelevant to the question I want to know so it's there if anyone wonders why. I am currently on 22-17 gear ratio, What is the equivalent gear ratio for 25t or 24t? Thanks Quote Link to comment Share on other sites More sharing options...
waybe2014 Posted June 25, 2015 Report Share Posted June 25, 2015 18-19 rear sprocket Quote Link to comment Share on other sites More sharing options...
Paperclip Posted June 25, 2015 Author Report Share Posted June 25, 2015 Thank you, someone else just messaged me and said the same. Much appreciated! Quote Link to comment Share on other sites More sharing options...
Filo Posted June 25, 2015 Report Share Posted June 25, 2015 Have you tried the arcade sprocket? 22t with bash guard and fit bmx cranks. Quote Link to comment Share on other sites More sharing options...
Ash-Kennard Posted June 26, 2015 Report Share Posted June 26, 2015 22/17=1.294 25/18=1.389 25/19=1.316 25/20=1.25 I would usually go for a slightly harsher gearing over an easier one. But 19 rear is the closest. 1 Quote Link to comment Share on other sites More sharing options...
Paperclip Posted June 26, 2015 Author Report Share Posted June 26, 2015 Have you tried the arcade sprocket? 22t with bash guard and fit bmx cranks. Its a option as a friend has one spare, though my chain might not fit. I do snap chains for fun! Quote Link to comment Share on other sites More sharing options...
Mark W Posted June 26, 2015 Report Share Posted June 26, 2015 There's no way your chain will fit the Arcade one. For future reference, if you need to work out a new chainring size when you're changing the rear to a set size: Divide the size of your old front chainring by your old rear sprocket, then multiply that answer by the size of your new rear sprocket. If you're doing a new front then just swap it around so you're dividing the rear by the old front chainring tooth number, then multiply by the new front tooth number. Using your toddler-specific gear ratio of 22:17 and changing that up to a 25t (most likely size you'll get in BMX size): 17/22 = 0.7727272727... 0.7727272727... * 25 = 19.318 So basically, 25:19 would be the closest. One thing you might need to do is run that through a chainstay length calculator to see if it's going to f**k with your wheel positioning much. If you go here (http://eehouse.org/fixin/formfmu.php) you'll see that you're probably going to have to run a half link to get it in the same rough area as 22:17. Quote Link to comment Share on other sites More sharing options...
DAMON WATSON. Posted June 26, 2015 Report Share Posted June 26, 2015 what chain cockshot? Quote Link to comment Share on other sites More sharing options...
jeff costello Posted June 26, 2015 Report Share Posted June 26, 2015 yeah, what chain? the kmc 710 fits on the arade sprocket easily. Quote Link to comment Share on other sites More sharing options...
Mark W Posted June 26, 2015 Report Share Posted June 26, 2015 Believe it's the 910. Quote Link to comment Share on other sites More sharing options...
Paperclip Posted June 26, 2015 Author Report Share Posted June 26, 2015 Works out at -1mm on the CS. Result! 910 yes. Quote Link to comment Share on other sites More sharing options...
Mark W Posted June 26, 2015 Report Share Posted June 26, 2015 What CS length are you running at the moment? Quote Link to comment Share on other sites More sharing options...
Paperclip Posted June 26, 2015 Author Report Share Posted June 26, 2015 I'm running 370 and it's 368.5 for 25/19. Quote Link to comment Share on other sites More sharing options...
Mark W Posted June 26, 2015 Report Share Posted June 26, 2015 Ah, cool - I thought you were down in the high 350's/low 360's kind of area Quote Link to comment Share on other sites More sharing options...
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