Bike Forums

Bike Forums (https://www.bikeforums.net/forum.php)
-   Bicycle Mechanics (https://www.bikeforums.net/bicycle-mechanics/)
-   -   I haven't been using washers under my crank bolts -- should I? (https://www.bikeforums.net/bicycle-mechanics/1033164-i-havent-been-using-washers-under-my-crank-bolts-should-i.html)

ThermionicScott 10-04-15 04:31 PM

I haven't been using washers under my crank bolts -- should I?
 
Square-taper, that is.

All of the bottom brackets I've purchased in recent years (Shimano, IRD, Velo-Orange, and Tange-Seiki) included bolts like this, with no separate washers:

http://i36.photobucket.com/albums/e2...nkbolts800.jpg

So I haven't been using any on my bikes. I haven't had any cranks come loose, ever, whether they had been installed for two months or two years. And there is always a reassuring amount of effort needed to crack the bolts loose when I do want to take the cranks off for any reason. It's for that reason that I hadn't given it much thought in 7 or so years of riding and fiddling with bikes.

On the occasion of reassembling my long-distance bike, it occurred to me to think about it, though. Is there a good reason to start using separate washers when installing my cranks, or should I keep doing what I'm doing?

Thanks. :)


P.S. Just did a little more Googling, and learned that crank bolts like mine are called "flange bolts" -- does the large flat area on the back of the head obviate the need for washers, then?

cny-bikeman 10-04-15 04:55 PM

Let's see - the flanged bolts seem to offer the same effect as separate washers, came as OEM and you haven't had a problem in 7 years on various bikes and setups. My diagnosis is that you have too much time on your hands, need to ride more and obsess less.

ThermionicScott 10-04-15 05:14 PM


Originally Posted by cny-bikeman (Post 18216935)
Let's see - the flanged bolts seem to offer the same effect as separate washers, came as OEM and you haven't had a problem in 7 years on various bikes and setups. My diagnosis is that you have too much time on your hands, need to ride more and obsess less.

That's me! :lol:

The thing I was wondering about most is whether there is a benefit to having an extra bearing surface to allow the crank bolt to turn without rubbing on the crank surface itself. Whether that direct friction might affect the torque generation or reading... like I said, I haven't experienced any problems, but I do like to follow good practices just in case there's something I wasn't aware of. (There are lots of references to making sure people have removed "that" washer before extracting cranks, after all.) Thanks!

dsbrantjr 10-04-15 05:26 PM

Don't overthink this. Grease the threads, torque the bolts and ride.

CliffordK 10-04-15 05:29 PM

I think Campagnolo (Strada) uses the washers. Shimano doesn't. Not sure why.

And, don't forget to remove the washers before trying to use the crank puller on your campy cranks.

superstring 10-04-15 06:33 PM


Originally Posted by ThermionicScott (Post 18216997)
That's me! :lol:

The thing I was wondering about most is whether there is a benefit to having an extra bearing surface to allow the crank bolt to turn without rubbing on the crank surface itself. Whether that direct friction might affect the torque generation or reading... like I said, I haven't experienced any problems, but I do like to follow good practices just in case there's something I wasn't aware of. (There are lots of references to making sure people have removed "that" washer before extracting cranks, after all.) Thanks!

I would grease the underside of the "washer" as well as the threads. Torque specs usually assume this.

hueyhoolihan 10-04-15 07:06 PM


Originally Posted by CliffordK (Post 18217034)
I think Campagnolo (Strada) uses the washers. Shimano doesn't. Not sure why.

And, don't forget to remove the washers before trying to use the crank puller on your campy cranks.

i suspect Shimano uses bolts with integrated washers just to avoid that problem. not that I have ever done such a thing :rolleyes:

trailangel 10-05-15 09:44 AM


Originally Posted by superstring (Post 18217164)
I would grease the underside of the "washer" as well as the threads. Torque specs usually assume this.

Read this:https://compasscycle.com/wp-content/...ctions_web.pdf
Compass says NOT to grease the washer. Must be dry to lock onto crank and keep from loosening.
And yes, they integrated the washer for people that forget to remove the washer and then use crank puller.

FastJake 10-05-15 09:54 AM


Originally Posted by ThermionicScott (Post 18216881)
P.S. Just did a little more Googling, and learned that crank bolts like mine are called "flange bolts" -- does the large flat area on the back of the head obviate the need for washers, then?

Yes.

Without the flat flange (normal bolt), you would need a washer.

ThermionicScott 10-05-15 10:10 AM


Originally Posted by FastJake (Post 18218477)
Yes.

Without the flat flange (normal bolt), you would need a washer.

Sweet, my mind is at ease. Thanks everyone! :thumb:

andr0id 10-05-15 10:17 AM


Originally Posted by hueyhoolihan (Post 18217229)
i suspect Shimano uses bolts with integrated washers just to avoid that problem. not that I have ever done such a thing http://www.bikeforums.net/images/smilies/rolleyes.gif

If Shimano wanted you to use washers, they'd be in the EV. :)

fietsbob 10-05-15 12:36 PM

what should you be doing at work when writing here, instead?

trailangel 10-05-15 01:38 PM


Originally Posted by fietsbob (Post 18219001)
what should you be doing at work when writing here, instead?

LOL
No work today. It stopped raining... beautiful day....75degrees.. puffy white clouds....I am rolling out soon!


All times are GMT -6. The time now is 04:32 PM.


Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.