Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 07-27-07, 04:40 AM   #1
redd
Junior Member
Thread Starter
 
Join Date: May 2007
Location: Dublin, Ireland
Bikes:
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Installing cranks with a rubber mallet. opinions?

Hi all, this is my first post and Iím just looking for some opinions.
I'm about to install a new Shimano UN 73 square taper bottom bracket with a stronglight crankset. in the shop i used to work in the standard practise was to flip the bike on its side place the left crank arm on a big chunk of soft wood we had and giving the right crank arm a few whacks with a rubber mallet at the point where it sits on the spindle then installing and tightening the nuts /bolts.
so I was surprised when browsing the park tools website their method just has the crankarms installed by tightening the bolt that goes into the spindle.

so is my method overkill? I know it works as this is how all the cranks on my bicycles were installed and they've never had problems but most of those have older style cup and bearing bottom brackets. is there anything I should consider with a sealed cartridge bearing bottom bracket like the UN 73?

thanks,
redd
redd is offline   Reply With Quote
Old 07-27-07, 04:52 AM   #2
metabike
Senior Member
 
metabike's Avatar
 
Join Date: Mar 2007
Bikes:
Posts: 395
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I still use the mallet/2x4 method for all BB types (square tapers, ISIS, etc).
metabike is offline   Reply With Quote
Old 07-27-07, 07:31 AM   #3
hairytoes
Senior Member
 
Join Date: Nov 2006
Bikes:
Posts: 467
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I was taught to use the hammer method. After I while, I realised that I'd hammer on the crank, put in the bolt - then push the crank on further when I tightened up the bolt.

So the hammering wasn't achieving anything, other than stressing the frame.

I don't bother with the hammer, my cranks don't come loose.
hairytoes is offline   Reply With Quote
Old 07-27-07, 07:50 AM   #4
tellyho
Your mom
 
Join Date: Aug 2006
Bikes:
Posts: 2,541
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I just use the bolt.
tellyho is offline   Reply With Quote
Old 07-27-07, 08:21 AM   #5
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
There is zero reason to hit cranks with a mallet to put them on. That's what the bolt is for.

Sounds like your shop had a bunch of mechanics who didn't know what they were doing.
operator is offline   Reply With Quote
Old 07-27-07, 08:27 AM   #6
I_bRAD
Call me The Breeze
 
I_bRAD's Avatar
 
Join Date: Aug 2006
Location: Corbyville Ontario
Bikes: 2004 Litespeed Siena, 1996 Litespeed Obed, 1992 Miele (unknown model), 1982 Meile Uno LS.
Posts: 3,699
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yeah, save the hammer for getting them off
I_bRAD is offline   Reply With Quote
Old 07-27-07, 09:10 AM   #7
redd
Junior Member
Thread Starter
 
Join Date: May 2007
Location: Dublin, Ireland
Bikes:
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by operator View Post
There is zero reason to hit cranks with a mallet to put them on. That's what the bolt is for.

Sounds like your shop had a bunch of mechanics who didn't know what they were doing.
thanks for all the replies,

in retrospect I think this method was used to fit the crank arm snugly on the spindle before the bolt was tightened especially when working on cheaper equipment. I have seen a new guy in the shop strip the threads on the bolt installing a crank without seating it correctly first.

I'll see how i get on when my new parts arrive.

redd.
redd is offline   Reply With Quote
Old 07-27-07, 10:04 AM   #8
rmfnla
Senior Member
 
rmfnla's Avatar
 
Join Date: May 2005
Location: La La Land (We love it!)
Bikes: Gilmour road, Curtlo road; both steel (of course)
Posts: 5,604
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by I_bRAD View Post
Yeah, save the hammer for getting them off
Save the hammer for the bone-head mechanics (nose-pickers?) who think this is a good way to install a crank.

I honestly thought this was a joke until metabike and hairytoes (really?) weighed in.
__________________
Today, I believe my jurisdiction ends here...
rmfnla is offline   Reply With Quote
Old 07-27-07, 10:28 AM   #9
GV27
Light Makes Right
 
GV27's Avatar
 
Join Date: Apr 2005
Location: Green Mountain, Colorado
Bikes: Gianni Motta Criterium, Dean Hardtail
Posts: 1,521
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
LOL - I read the first couple of replies and I was thinking - damn, I've been doing this wrong for 20 years?!?! I've never hit a bike with a hammer except out of anger.
GV27 is offline   Reply With Quote
Old 07-27-07, 11:26 AM   #10
rmfnla
Senior Member
 
rmfnla's Avatar
 
Join Date: May 2005
Location: La La Land (We love it!)
Bikes: Gilmour road, Curtlo road; both steel (of course)
Posts: 5,604
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by GV27 View Post
LOL - I read the first couple of replies and I was thinking - damn, I've been doing this wrong for 20 years?!?! I've never hit a bike with a hammer except out of anger.
Bad bike!!!
__________________
Today, I believe my jurisdiction ends here...
rmfnla is offline   Reply With Quote
Old 07-27-07, 11:47 AM   #11
kmart
Blue Light Special
 
kmart's Avatar
 
Join Date: Sep 2006
Location: Bay Area, Sunny Cali
Bikes: '05 Felt F55, Schwinn Prologue road bike, '86 Centurion DS Iron Man, Sette Flite AM MTB
Posts: 1,467
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Carbon cranks+hammer=bad idea
kmart is offline   Reply With Quote
Old 07-27-07, 12:01 PM   #12
DMF 
Elitist Troglodyte
 
DMF's Avatar
 
Join Date: Jun 2006
Location: Dallas
Bikes: 03 Raleigh Professional (steel)
Posts: 6,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You can use the mallet, but really, what's the point?? All you save is a few turns on the bolt and you surely waste that time reaching for the mallet and block!

Besides, with my air impact gun the difference is maybe 1/2 second...
__________________
Stupidity got us into this mess - why can't it get us out?

- Will Rogers
DMF is offline   Reply With Quote
Old 07-27-07, 04:38 PM   #13
MudPie
Senior Member
 
MudPie's Avatar
 
Join Date: May 2004
Location: Southern California
Bikes:
Posts: 1,874
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I always torque the crankbolts to spec and never had problems with either square or ISIS cranks. The mechanical advantage of the screw is tremendous.
MudPie is offline   Reply With Quote
Old 07-27-07, 06:53 PM   #14
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,687
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by MudPie View Post
I always torque the crankbolts to spec and never had problems with either square or ISIS cranks. The mechanical advantage of the screw is tremendous.
Absolutely correct. If you torque the bolts to the correct tightness, nothing else is needed.

I'd worry about damaging the bb bearings from the hammer impact if the spindle wasn't supported well enough.
HillRider is online now   Reply With Quote
Old 07-27-07, 07:43 PM   #15
JanMM
rebmeM roineS
 
JanMM's Avatar
 
Join Date: Jan 2006
Location: In Central IN
Bikes: RANS V3, RANS V-Rex, RANS Screamer
Posts: 13,225
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Whack the Mole.......uh.............crankarm
JanMM is offline   Reply With Quote
Old 07-27-07, 07:54 PM   #16
cny-bikeman 
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Bikes: 2008 Novara Randonee - love it. Would have more bikes if I had time to ride them all. Previous bikes: 1968 Motobecane Mirage, 1972 Moto Grand Jubilee (my fav), Jackson Rake 16, 1983 C'dale ST500.
Posts: 6,173
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by GV27 View Post
LOL - I read the first couple of replies and I was thinking - damn, I've been doing this wrong for 20 years?!?! I've never hit a bike with a hammer except out of anger.
Obviously not a mechanic....one of my favorite tools has always been a dead blow hammer.
cny-bikeman is offline   Reply With Quote
Old 07-27-07, 07:54 PM   #17
old_alfie
Title-Les
 
Join Date: Feb 2007
Bikes:
Posts: 172
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by rmfnla View Post
Save the hammer for the bone-head mechanics (nose-pickers?) who think this is a good way to install a crank.

I honestly thought this was a joke until metabike and hairytoes (really?) weighed in.
I would never take a hammer or mallet to one of my bikes but geeze guys, a good nose-picking sure feels good sometimes.
alf
old_alfie is offline   Reply With Quote
Old 07-27-07, 09:23 PM   #18
2372ighost
118AHC "Thunderbirds"
 
2372ighost's Avatar
 
Join Date: Oct 2005
Location: AL.
Bikes: Numerous (wife says to many)
Posts: 232
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
+1 on the nose picking
2372ighost is offline   Reply With Quote
Old 07-27-07, 09:25 PM   #19
rmfnla
Senior Member
 
rmfnla's Avatar
 
Join Date: May 2005
Location: La La Land (We love it!)
Bikes: Gilmour road, Curtlo road; both steel (of course)
Posts: 5,604
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by 2372ighost View Post
+1 on the nose picking
old alfie is new to the Forums and doesn't remember sydney; 2372ighost might know better.
__________________
Today, I believe my jurisdiction ends here...
rmfnla is offline   Reply With Quote
Old 07-27-07, 09:35 PM   #20
Wordbiker
Pwnerer
 
Wordbiker's Avatar
 
Join Date: Jun 2005
Location: Pagosa Springs, CO, USA
Bikes: Road, MTB, Cruiser, Chopper, BMX
Posts: 2,907
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
There's a problem with nose picking?
__________________
Quote:
Originally Posted by ahsposo View Post
Ski, bike and wish I was gay.
Wordbiker is offline   Reply With Quote
Old 07-27-07, 09:40 PM   #21
rmfnla
Senior Member
 
rmfnla's Avatar
 
Join Date: May 2005
Location: La La Land (We love it!)
Bikes: Gilmour road, Curtlo road; both steel (of course)
Posts: 5,604
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yeesh...
__________________
Today, I believe my jurisdiction ends here...
rmfnla is offline   Reply With Quote
Old 07-27-07, 10:19 PM   #22
old_alfie
Title-Les
 
Join Date: Feb 2007
Bikes:
Posts: 172
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by rmfnla View Post
old alfie is new to the Forums and doesn't remember sydney; 2372ighost might know better.
Hmm, I just "searched" sydney and read the tragedy of his death. There're way too many posts tho for me to read. I'd appreciate your putting sydney in context with nose picking.
alf
old_alfie is offline   Reply With Quote
Old 07-28-07, 04:44 AM   #23
Stacey
Non Tribuo Anus Rodentum and off to the next adventure (RIP)
 
Stacey's Avatar
 
Join Date: Dec 2002
Bikes:
Posts: 9,162
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by cny-bikeman View Post
Obviously not a mechanic....one of my favorite tools has always been a dead blow hammer.
Closely followed by an adjustable wrench.
__________________
Stacey is offline   Reply With Quote
Old 07-28-07, 05:44 AM   #24
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,687
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by old_alfie View Post
Hmm, I just "searched" sydney and read the tragedy of his death. There're way too many posts tho for me to read. I'd appreciate your putting sydney in context with nose picking.
alf
Sydney was a well regarded regular here and had a somewhat caustic view of a lot of things done by bike mechanics. He frequently used "nose picker" as a dismissive term for some of the more inept ones.
HillRider is online now   Reply With Quote
Old 07-28-07, 07:54 AM   #25
metabike
Senior Member
 
metabike's Avatar
 
Join Date: Mar 2007
Bikes:
Posts: 395
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
To paraphrase President Nixon, "I am not a nosepicker." And to paraphrase Arnold from one of his best roles (Kindergarten Cop), "Eets not a hammer!", it's a rubber mallet that I was taught to use. And the seating of the arm is done with a tap, not a full windup, windmill, stake driving, blow. And of course, I wouldn't take a mallet to CF; honestly, that didn't come to mind because my work is mostly done in the less rarefied air of good old fashioned, alloy cranksets. Finally, lest anyone think hammers and bikes don't go together, I submit exhibit one: the 3-piece cottered crankset. In all seriousity, I have worked on bicycles for a long time and am proud of my work. This has taught me that the next time I am tempted to post a quick reply, I will pause to make sure that I cover all my bases so that I don't suffer the slings and arrows of this far flung interweb world.
metabike is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 07:32 AM.