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.

My Evening at the Co-op

Old 07-24-18, 10:02 PM
  #1  
Aubergine 
Bad example
Thread Starter
 
Join Date: Nov 2015
Location: Seattle and Reims
Posts: 2,948
Mentioned: 33 Post(s)
Tagged: 0 Thread(s)
Quoted: 771 Post(s)
Liked 16 Times in 13 Posts
My Evening at the Co-op

Every so often someone comes in with a bike that, for whatever reason, just does not want to get fixed.

Today a fellow came in with a lovely old lugged steel touring bike. It was probably early 80s, and had Mountech derailleurs front and rear, as well as a six speed freewheel and a Sugino triple crank. Our client wanted to replace two of the chainrings, the freewheel, and the chain. So one of our other volunteers proceeded to help our client pull off the crank, chain, and rear wheel. Our client changed out the chainrings and the freewheel and then tried to bolt it all back up.

At this point I butted in and tried out the bottom bracket. It felt horrible, so I suggested that they pull that and check it out before bolting the cranks on. It was a sealed Suntour BB and the reason it felt horrible was because one of the sealed bearings had disintegrated.

We fortunately had had a couple cartridge BBs so I pulled one out. It was unfortunately too short for the triple, so our client pulled off the granny gear and turned the crank back into a double so that he could at least ride back home tonight. We buttoned the crank up well enough (after pulling out quite a bit of blue plastic scurf from one of the crank bolt holes) and then put on the chain.

The chain immediately jammed between the freewheel and the frame. At first we thought that perhaps the new freewheel had not been screwed on right, but then I noticed that the old freewheel was a Suntour narrow six speed, and the new Shimano freewheel was a good 1/8 inch wider. SOOOO we told our client what had gone wrong and then adjusted the limit screw to block out the high gear in the back.

The chain now spun freely but yet another issue arose. For some reason, the chain refused to seat on the new middle chainring. By this time we were within about two minutes of closing, so once again we adjusted the limit screws to keep the chain on the big ring in the front. At least our client did not have too many hills on the way home . . .

We we expect him back on our next open day with a new BB and chainrings. We may need to redish the wheel to work with the new freewheel. We’ll see.
__________________
Keeping Seattle’s bike shops in business since 1978
Aubergine is offline  
Old 07-24-18, 10:12 PM
  #2  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 11,567

Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1702 Post(s)
Likes: 0
Liked 27 Times in 23 Posts
Missing in this all too common story is indexing. Andy
__________________
AndrewRStewart
Andrew R Stewart is offline  
Old 07-24-18, 10:41 PM
  #3  
Aubergine 
Bad example
Thread Starter
 
Join Date: Nov 2015
Location: Seattle and Reims
Posts: 2,948
Mentioned: 33 Post(s)
Tagged: 0 Thread(s)
Quoted: 771 Post(s)
Liked 16 Times in 13 Posts
Originally Posted by Andrew R Stewart View Post
Missing in this all too common story is indexing. Andy
Fortunately.
__________________
Keeping Seattle’s bike shops in business since 1978
Aubergine is offline  
Old 07-30-18, 04:34 PM
  #4  
Aubergine 
Bad example
Thread Starter
 
Join Date: Nov 2015
Location: Seattle and Reims
Posts: 2,948
Mentioned: 33 Post(s)
Tagged: 0 Thread(s)
Quoted: 771 Post(s)
Liked 16 Times in 13 Posts
An update: the owner came back in with a new BB. We put it in and set the limit screws, so he at least had use of the granny and middle rings. Next, we looked again at the middle ring and discovered that it was too wide for the chain. He had gotten it at a used parts place, and it probably came off a Fixie. So we put the original middle ring back on.

After all that, we talked about gearing. The rear freewheel was still too wide to use the highest gear, and I told him that he could either get the rear wheel redished for his new freewheel, or spread the frame to 130 so he could fit a ten speed cassette. His existing rear wheel was quite worn, so he needed a new wheel in any case. His original crank had a half step plus granny (48-44-28), which works well with a five or six speed rear, but I told him that if he went to a ten speed in the rear he could use a 38 tooth middle ring to good advantage. Our client got a good education, at least!
__________________
Keeping Seattle’s bike shops in business since 1978
Aubergine is offline  
Old 07-30-18, 05:09 PM
  #5  
dedhed
SE Wis
 
dedhed's Avatar
 
Join Date: Apr 2005
Location: Milwaukee, WI
Posts: 4,980

Bikes: '68 Raleigh Sprite, '02 Raleigh C500, '84 Raleigh Gran Prix, '91 Trek 400

Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 651 Post(s)
Liked 40 Times in 33 Posts
HIs Mountech RD likely will not have the range to shift across a 10s cassette and possibly his shifters also.
dedhed is offline  
Old 07-30-18, 05:23 PM
  #6  
Aubergine 
Bad example
Thread Starter
 
Join Date: Nov 2015
Location: Seattle and Reims
Posts: 2,948
Mentioned: 33 Post(s)
Tagged: 0 Thread(s)
Quoted: 771 Post(s)
Liked 16 Times in 13 Posts
Originally Posted by dedhed View Post
HIs Mountech RD likely will not have the range to shift across a 10s cassette and possibly his shifters also.
Oh indeed. But that is for another day.
__________________
Keeping Seattle’s bike shops in business since 1978
Aubergine is offline  
Old 07-31-18, 08:37 AM
  #7  
Chris Chicago
Senior Member
 
Chris Chicago's Avatar
 
Join Date: May 2009
Location: near north side
Posts: 1,287
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 62 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
would a 5 speed freewheel solve anything?
Chris Chicago is offline  
Old 07-31-18, 09:20 AM
  #8  
Aubergine 
Bad example
Thread Starter
 
Join Date: Nov 2015
Location: Seattle and Reims
Posts: 2,948
Mentioned: 33 Post(s)
Tagged: 0 Thread(s)
Quoted: 771 Post(s)
Liked 16 Times in 13 Posts
Originally Posted by Chris Chicago View Post
would a 5 speed freewheel solve anything?
At this point, not really. He does have five working cogs in the back, and he needs to figure out what he wants to do with his rear wheel. I like building wheels so his cheapest option is just to get a new rim and spokes for his existing hub. I can then build it up with the six speed and move a washer or two so the six speeds all work.
__________________
Keeping Seattle’s bike shops in business since 1978
Aubergine is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
agmetal
Bicycle Mechanics
6
02-18-14 10:29 PM
mjordan123
Bicycle Mechanics
5
06-08-09 08:20 AM
mutumbo28
Bicycle Mechanics
16
09-09-08 01:28 PM
angelo
Classic & Vintage
5
08-01-08 10:23 PM
MudPie
Mountain Biking
6
05-17-04 08:11 PM

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

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