Sports: Shimano M131 Crankset (170mm, 48/38/28) - Shimano

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Shimano Biopace Chainring Popular Q&A

Q: How to Replace a Shimano Chainring.
A: 1. Choose any one of the 5 chainring bolts to remove first. The bolts are spaced along the diameter of the outer chainring. 2. Fit a flathead screwdriver agains... Read More »

Q: How to Swap a Shimano Ultegra Chainring.
A: 1. Use the front Shimano Ultegra gear shifter to shift the front derailleur and chain to the smallest chainring. Elevate the rear wheel and spin the pedals forw... Read More »

Q: Shimano 42 tooth biopace?
A: I replaced my Biopace with round chainrings a few years ago and I replaced the crank at the same time. I don't remember if I had to change the cranks or if I ju... Read More »

Q: Part of the difficulty is the biopace system - i might also want ...
A: I think you should go with your original plan of a triple. Since you have 52-42 now, just go with 52-42-30. Here is a web site that may help you evaluate the po... Read More »

Q: Can i add another sprocket (currently have two - 52 & 42) to my c...
A: Hello Robert. You cannot add additional chain rings to a double. Also the Biopace is an oval shaped crank set, where as others are round. You would also have to... Read More »