Hello all -
I am new to this forum. I recently resumed using my road bicycle again after a few years away. I need some help/advice regarding bottom brackets.
I have a 2010 Trek 2.1 alpha road bike (Shimo 105 components w/ a compact R-600 50/34 crank) purchased in the U.S., that I have used only on a Cycle-Ops trainer for less than 10 hours total since the bike was new. I have never ridden the bike on the road, but I am hoping to do so soon.
With the help of youtube, I have serviced/adjusted the front/rear derailleurs and everything is quiet and shifting crisply when freewheeling on a bike stand. However, I experience a grinding type of vibration that seems to come from the front crank when using the trainer. I backed-off the trainer resistance wheel from the bike's rear tire, and I still get the grinding vibration when pedaling freewheel while lightly applying the rear brake to simulate riding resistance. It appears the vibration is worse as pedal force is increased and with higher gears. I am suspecting the bottom bracket may need service or replacement. The BB has never been serviced.
I removed the chain from the front chain-ring and checked the crank for play/looseness...everything seems tight and in good order. The crank turns freely with no roughness, grinding noise or resistance. However, as I turn the crank slowly, I can hear a subtle 'clicking' noise intermittently. I suspect this may be the ball bearings moving and contacting each other in the bearing housing?
Can anyone suggest what might be the problem? Does the BB needs cleaning/repacking/replacement?
Can anyone recommend BB options for this model? I don't mind upgrading over the stock BB. I believe this model uses a Shimano Hollowtech II bottom bracket...the BB has the following markings "BC 1.37 x 24". I believe the frame is 68 mm at the crank location. Also, I found a website that claims to have better quality bearing sets (larger, harder, ball bearings)...I'm not sure if this is the best option vs. replacing the BB altogether.
I have tools ordered. I will be performing the service on the bike.
Advice appreciated...
Regards
I am new to this forum. I recently resumed using my road bicycle again after a few years away. I need some help/advice regarding bottom brackets.
I have a 2010 Trek 2.1 alpha road bike (Shimo 105 components w/ a compact R-600 50/34 crank) purchased in the U.S., that I have used only on a Cycle-Ops trainer for less than 10 hours total since the bike was new. I have never ridden the bike on the road, but I am hoping to do so soon.
With the help of youtube, I have serviced/adjusted the front/rear derailleurs and everything is quiet and shifting crisply when freewheeling on a bike stand. However, I experience a grinding type of vibration that seems to come from the front crank when using the trainer. I backed-off the trainer resistance wheel from the bike's rear tire, and I still get the grinding vibration when pedaling freewheel while lightly applying the rear brake to simulate riding resistance. It appears the vibration is worse as pedal force is increased and with higher gears. I am suspecting the bottom bracket may need service or replacement. The BB has never been serviced.
I removed the chain from the front chain-ring and checked the crank for play/looseness...everything seems tight and in good order. The crank turns freely with no roughness, grinding noise or resistance. However, as I turn the crank slowly, I can hear a subtle 'clicking' noise intermittently. I suspect this may be the ball bearings moving and contacting each other in the bearing housing?
Can anyone suggest what might be the problem? Does the BB needs cleaning/repacking/replacement?
Can anyone recommend BB options for this model? I don't mind upgrading over the stock BB. I believe this model uses a Shimano Hollowtech II bottom bracket...the BB has the following markings "BC 1.37 x 24". I believe the frame is 68 mm at the crank location. Also, I found a website that claims to have better quality bearing sets (larger, harder, ball bearings)...I'm not sure if this is the best option vs. replacing the BB altogether.
I have tools ordered. I will be performing the service on the bike.
Advice appreciated...
Regards