I'd love to know if the chainring sprocket works. I spent $30 with shipping for my 36 tooth 415 sprocket. Plus I had to spend 20 minutes grinding down the giant square teeth on the beastly thing so the chain would actually settle! I have two other bikes which now need 36 t's...I always just assumed standard bike chain sprockets were the wrong size and especially too thin. I'll be checking back...let us know how it goes!!!