Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Question about bicycle cassette

Notices
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.

Question about bicycle cassette

Old 04-04-20, 05:24 AM
  #1  
amlis_vess
Junior Member
Thread Starter
 
Join Date: Apr 2020
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Question about bicycle cassette

HI,

I bought an Shimano HG-50 8 speed cassette.

When fitted, I could see that it did not seem to be exactly true.

For example, if I turn it backwards with my fingers and use a spoke as a reference point, it deviates by at least 1mm

I took everything apart and tightened up the free-hub.

The free-hub run perfectly true.

It was still the same when reassembled.

So I sent off for another HG-50 ( intending to send the defective one back).

The newest HG-50 was the same.

When I try I put on another new cassette ( an HG model but very old stock) it runs true ( it is a 7 speed with a spacer).

Does anyone have any helpful input.

Thank you
amlis_vess is offline  
Old 04-04-20, 06:58 AM
  #2  
Bill Kapaun
Really Old Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 11,905

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 1076 Post(s)
Liked 270 Times in 212 Posts
It's normal.
Bill Kapaun is online now  
Old 04-04-20, 07:29 AM
  #3  
grizzly59
Senior Member
 
Join Date: Aug 2016
Posts: 389
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 143 Post(s)
Liked 57 Times in 43 Posts
How true was the old cassette?
grizzly59 is offline  
Old 04-04-20, 07:34 AM
  #4  
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 29,925

Bikes: Catrike 559 I own some others but they don't get ridden very much.

Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1444 Post(s)
Liked 351 Times in 216 Posts
It seems like I used to have some 1mm or 1/2mm spacers around from some cassette applications. See if you can find one of those and try putting it behind your cassette. My bet is that'll fix your problem.
__________________
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
Retro Grouch is offline  
Old 04-04-20, 10:01 AM
  #5  
amlis_vess
Junior Member
Thread Starter
 
Join Date: Apr 2020
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Question about bicycle cassette

Originally Posted by grizzly59 View Post
How true was the old cassette?
HI,
Thanks for the reply.
The old cassette was perfectly true as is the 7 speed with spacer,

But the two new HG50s, bought from different stores, are not.
amlis_vess is offline  
Old 04-04-20, 10:03 AM
  #6  
amlis_vess
Junior Member
Thread Starter
 
Join Date: Apr 2020
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Retro Grouch View Post
It seems like I used to have some 1mm or 1/2mm spacers around from some cassette applications. See if you can find one of those and try putting it behind your cassette. My bet is that'll fix your problem.
Hi,

Thanks for getting back to me.

The cassette is not loose at all; it fits perfectly but , as I said, seems to show a buckle.
amlis_vess is offline  
Old 04-04-20, 10:05 AM
  #7  
amlis_vess
Junior Member
Thread Starter
 
Join Date: Apr 2020
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Question about bicycle cassette

Originally Posted by Bill Kapaun View Post
It's normal.
Hi,

Thanks for the info.
I knew that freewheels often showed unevenness, due to sightly off-centre threads on the wheel, but I have never noticed it on cassettes before; I just must have been lucky.
amlis_vess is offline  
Old 04-04-20, 02:15 PM
  #8  
tFUnK
Senior Member
 
Join Date: Jun 2002
Location: San Jose, CA
Posts: 2,698

Bikes: Too many bikes, too little time to ride

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 102 Post(s)
Liked 46 Times in 41 Posts
Are you certain it's not just the various shift ramps on the cogs that give the illusion that it's not true? Perhaps the old 7sp cassette did not have very prominent shift ramps (if at all)?
tFUnK is offline  
Likes For tFUnK:
Old 04-04-20, 03:34 PM
  #9  
alcjphil
Senior Member
 
alcjphil's Avatar
 
Join Date: Jun 2002
Location: Montreal, Quebec
Posts: 3,928
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 965 Post(s)
Liked 315 Times in 209 Posts
Originally Posted by tFUnK View Post
Are you certain it's not just the various shift ramps on the cogs that give the illusion that it's not true? Perhaps the old 7sp cassette did not have very prominent shift ramps (if at all)?
I was thinking the same thing
alcjphil is online now  
Old 04-04-20, 05:30 PM
  #10  
Geezerdan
Member
 
Join Date: Nov 2019
Posts: 26
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Liked 2 Times in 2 Posts
Have you confirmed that the area where the wheel is mounted is true in line with the frame?
Geezerdan is offline  
Old 04-05-20, 05:32 AM
  #11  
amlis_vess
Junior Member
Thread Starter
 
Join Date: Apr 2020
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Question about bicycle cassette

Originally Posted by Geezerdan View Post
Have you confirmed that the area where the wheel is mounted is true in line with the frame?
Thanks for the tip but it is in straight.
amlis_vess is offline  
Old 04-05-20, 05:39 AM
  #12  
amlis_vess
Junior Member
Thread Starter
 
Join Date: Apr 2020
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Question about bicycle cassette

Originally Posted by tFUnK View Post
Are you certain it's not just the various shift ramps on the cogs that give the illusion that it's not true? Perhaps the old 7sp cassette did not have very prominent shift ramps (if at all)?

HI,

Yes, I thought that too.

So I used a magic marker on the rear part of the large cog as I turned it; it is like a buckled wheel ; marker on about a third of the cog , thin to thick to thin.

I tried the inner part of the large cog too; the marker shows on only one point ( four adjacent teeth) ; there are 4 separate ramped sections; so it is not the ramps.

Thanks
amlis_vess is offline  
Old 04-05-20, 10:18 AM
  #13  
Iride01
Senior Member
 
Iride01's Avatar
 
Join Date: Jul 2017
Location: Mississippi
Posts: 4,262

Bikes: '20 Tarmac Disc Comp '91 Schwinn Paramount '78 Raleigh Competition GS

Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 1596 Post(s)
Liked 498 Times in 379 Posts
Put it all together and ride it. Then you'll know for sure if it's an issue. Some will move more than what we'd imagine is acceptable. In actual use it likely isn't an issue for something that doesn't turn very fast.
Iride01 is online now  
Old 04-05-20, 10:33 AM
  #14  
BCDrums
Recreational Road Cyclist
 
BCDrums's Avatar
 
Join Date: Sep 2013
Location: MetroWest, Mass.
Posts: 281

Bikes: 1990 Peter Mooney road bike

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 137 Post(s)
Liked 65 Times in 44 Posts
Originally Posted by amlis_vess View Post
HI,

I bought an Shimano HG-50 8 speed cassette.

When fitted, I could see that it did not seem to be exactly true.

So I sent off for another HG-50 ( intending to send the defective one back). The newest HG-50 was the same.

When I try I put on another new cassette ( an HG model but very old stock) it runs true ( it is a 7 speed with a spacer).

Does anyone have any helpful input.

Thank you
I had this issue once with a 9sp cassette. The cassette was not seated properly against the rear surface of the free hub. I removed it and re-fitted it a couple of times and the wiggle went away. But I am sure you have tried this by now.

Did you, for some reason, disassemble the cassette? I modify my cassettes ( I remove the second position 14T on a 13-25T and add a 28T at the rear) and sometimes in reassembly the plastic spacers don't sit correctly and mess up the spacing of the cassette cogs.

Good luck.
BCDrums is offline  

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 - Do Not Sell My Personal Information -

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