Pedaling resistance

ghibit · 06-29-2006, 06:57 PM

hey y'all. i had my bike on a work stand the other day and i noticed a lot of resistance when turning the cranks by hand. shop took a look, didn't see anything rubbing and couldn't pinpoint the problem. i have a howitzer with an e.13 SRS (pinned to bb). could my bb and chainguide combo be the root of the problem? anyone dare to venture an intelligent guess as to why? thanks and happy trails.

Chunk · 06-29-2006, 07:53 PM

well first off, your shop sucks....

biggles604 · 06-29-2006, 08:05 PM

Take the cranks off and check that the BB bearings spin freely. Is the howitzer external? If so, then you could be over tightening the cranks and side loading the bearings.
Also, totally daft, but I have had a problem when setting up an E13 that I had the guide roller plate rubbing the bash ring. Totally stupid as I mentioned, but it is possible.

ghibit · 06-29-2006, 08:41 PM

Quote:

Originally Posted by biggles604

Take the cranks off and check that the BB bearings spin freely. Is the howitzer external? If so, then you could be over tightening the cranks and side loading the bearings.

yes, it's external. i'll check to see if the crank bolts have been over-torqued. thanks.

DaveM · 06-29-2006, 10:49 PM

Quote:

Originally Posted by biggles604

Also, totally daft, but I have had a problem when setting up an E13 that I had the guide roller plate rubbing the bash ring. Totally stupid as I mentioned, but it is possible.

hehehe, you too eh Steve? Now I can share the dumbass award!

biggles604 · 06-29-2006, 11:31 PM

Quote:

Originally Posted by davet

hehehe, you too eh Steve? Now I can share the dumbass award!

It's surprisingly easy to do, and even easier to not realise that you did it because your mind edits out the option that you were a total idiot!

Nah, the award is yours. You chose to have your surgery

DaveM · 06-30-2006, 01:31 AM

Quote:

Originally Posted by biggles604

It's surprisingly easy to do, and even easier to not realise that you did it because your mind edits out the option that you were a total idiot!

Nah, the award is yours. You chose to have your surgery

The fact that I pulled my cranks off 3 times looking for a problem with the bearings before I saw the roller interference seals that one up for me anyways.

I only chose to have the surgery because I couldn't walk any more.

Tonestar · 06-29-2006, 10:40 PM

Did you check your rear hub?? Maybe you are looking in the wrong spot.

ghibit · 06-30-2006, 05:40 PM

Quote:

Originally Posted by Tonestar

Did you check your rear hub?? Maybe you are looking in the wrong spot.

no problem with the rear hub. i'm pretty sure it's got something to do with the bb.

Chunk · 06-30-2006, 06:10 PM

Quote:

Originally Posted by ghibit

no problem with the rear hub. i'm pretty sure it's got something to do with the bb.

as my first post kind of implied, if you cant get this sorted out yourself in the next day or so, you really should go to a different shop. Bikes are pretty damn simple machines. If a mechanic cant find where significant friction in the drivetrain is coming from, that mechanic sucks.

ghibit · 06-30-2006, 06:39 PM

Quote:

Originally Posted by Chunk

as my first post kind of implied, if you cant get this sorted out yourself in the next day or so, you really should go to a different shop. Bikes are pretty damn simple machines. If a mechanic cant find where significant friction in the drivetrain is coming from, that mechanic sucks.

good point.

ghibit · 07-03-2006, 01:47 AM

i have loosened the non-drive side crankarm bolt and the resistance has disappeared (the cranks are spinning normally). now, here

gotham · 06-30-2006, 01:42 AM

My pedals squeak whenever I reach the top of my pedaling motion..where might the looseness be? I've tightened the cranks as much as they'll go.

biggles604 · 07-03-2006, 04:24 AM

It's the one major failing of the external bottom bracket. Because the shell size varies, it's impossible to have a spacer in the middle of the BB to stop the internal races of the bearings so that the cranks will not side load the bearings (causing premature wear). Given that design flaw, the manufacturers should not have gone with deep groove ball bearings (6xx series, instead an angular contact or roller bearing would have been much more appropriate).
My plan is to machine a precision spacer that will work on my bike only, which should provide a much longer run life.

06-29-2006, 06:57 PM	#1
ghibit Registered User Join Date: Jun 2005 Location: T6W1X4 Posts: 71 Rep Power: 0	Pedaling resistance hey y'all. i had my bike on a work stand the other day and i noticed a lot of resistance when turning the cranks by hand. shop took a look, didn't see anything rubbing and couldn't pinpoint the problem. i have a howitzer with an e.13 SRS (pinned to bb). could my bb and chainguide combo be the root of the problem? anyone dare to venture an intelligent guess as to why? thanks and happy trails.

06-29-2006, 07:53 PM	#2
Chunk Sexy beast Join Date: Sep 2005 Location: far from you Posts: 3,934 Rep Power: 328921	well first off, your shop sucks.... __________________ thinkin bout bikes

07-03-2006, 01:47 AM	#12
ghibit Registered User Join Date: Jun 2005 Location: T6W1X4 Posts: 71 Rep Power: 0	Update i have loosened the non-drive side crankarm bolt and the resistance has disappeared (the cranks are spinning normally). now, here

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06-29-2006, 08:05 PM	#3
biggles604 Registered User Join Date: Aug 2003 Posts: 11,512 Rep Power: 6073796	Take the cranks off and check that the BB bearings spin freely. Is the howitzer external? If so, then you could be over tightening the cranks and side loading the bearings. Also, totally daft, but I have had a problem when setting up an E13 that I had the guide roller plate rubbing the bash ring. Totally stupid as I mentioned, but it is possible.

06-29-2006, 10:40 PM	#8
Tonestar Registered User Join Date: Aug 2003 Posts: 1,575 Rep Power: 592748	Did you check your rear hub?? Maybe you are looking in the wrong spot.

07-03-2006, 04:24 AM	#14
biggles604 Registered User Join Date: Aug 2003 Posts: 11,512 Rep Power: 6073796	It's the one major failing of the external bottom bracket. Because the shell size varies, it's impossible to have a spacer in the middle of the BB to stop the internal races of the bearings so that the cranks will not side load the bearings (causing premature wear). Given that design flaw, the manufacturers should not have gone with deep groove ball bearings (6xx series, instead an angular contact or roller bearing would have been much more appropriate). My plan is to machine a precision spacer that will work on my bike only, which should provide a much longer run life.