help! tightening shimano 105 crank
I'm really confused and need some help.
My bike has got current 105 groupset. In particular the chainset is (I think) Shimano 105 5600 hollowtech II like this
http://www.wiggle.co.uk/p/Cycle/7/Shima ... 360020764/
I'd been getting a bit of a creaking noise from the non-driveside crank/pedal/cleat or something. Couldn't find the problem. Then I noticed that the crank was slightly loose. Bad news. The opposing bolts that fix the crank to the axle were loose so I tightened them. I was under the impression that these were not the main things holding the crank tight - somewhere under the cap would be a nice big nut. I struggled to get the cap off and in any case didnt have a big spanner with me, so did some more miles home. The crank became looser again.
At home, I managed to remove the threaded cap (it has a large star shaped, but not torx, recess which looks like it should have a special tool but I managed without.
I was rather dumbfounded to find that there was no other fastening underneath it. I removed the crank, degreased everything, regreased it and re assembled it. THis time I gave the opposing bolts more torque. SO far so good but I'm a bit worried because:
1. I thought the opposing bolts didnt need much torque (in fact shouldnt have it). I havent got a torque wrench but I applied a good tweak with a decent allen key
2. is the cap actually a functional fastening? should it have some serious torque? It seems to lightweight to take that
I know riding a bike with loose cranks is a good way to screwing your crankset, so can anyone help?
BTW, it's difficult to get to a LBS before the weekend because I commute on the bike everyday and it spends the day at a station.
Thanks,
J
My bike has got current 105 groupset. In particular the chainset is (I think) Shimano 105 5600 hollowtech II like this
http://www.wiggle.co.uk/p/Cycle/7/Shima ... 360020764/
I'd been getting a bit of a creaking noise from the non-driveside crank/pedal/cleat or something. Couldn't find the problem. Then I noticed that the crank was slightly loose. Bad news. The opposing bolts that fix the crank to the axle were loose so I tightened them. I was under the impression that these were not the main things holding the crank tight - somewhere under the cap would be a nice big nut. I struggled to get the cap off and in any case didnt have a big spanner with me, so did some more miles home. The crank became looser again.
At home, I managed to remove the threaded cap (it has a large star shaped, but not torx, recess which looks like it should have a special tool but I managed without.
I was rather dumbfounded to find that there was no other fastening underneath it. I removed the crank, degreased everything, regreased it and re assembled it. THis time I gave the opposing bolts more torque. SO far so good but I'm a bit worried because:
1. I thought the opposing bolts didnt need much torque (in fact shouldnt have it). I havent got a torque wrench but I applied a good tweak with a decent allen key
2. is the cap actually a functional fastening? should it have some serious torque? It seems to lightweight to take that
I know riding a bike with loose cranks is a good way to screwing your crankset, so can anyone help?
BTW, it's difficult to get to a LBS before the weekend because I commute on the bike everyday and it spends the day at a station.
Thanks,
J
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Comments
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Hi, can be a bit confusing if it's your first look at hollowtech cranks.
This is the sequence.
Fit the L/H crank but do not tighten the bolts yet. You need to screw in the little endcap to preload the cranks against the bearing seals. A bit more than hand tight is ok, does not need to be over tightened. Then tighten the clamp bolts, fairly tight but do not over tighten. Recheck the bolts after a couple of rides.He is not the messiah, he is a very naughty boy !!0 -
great, thanks - that is pretty much what I did0
