Retrobike Forum Index

It is currently Tue Jan 19, 2021 9:41 pm

* Login   * Register * Search  * FAQ

Forum rules


**Classified Rules & Guidance - Feedback - Dispute Procedure - Gold Trader Status - All Adverts Need A Price - 5 Adverts Maximum - Leave Prices In Sold Adverts - No cross posting adverts**



Post new topic Reply to topic  [ 29 posts ]  Go to page Previous  1, 2, 3
Author Message
PostPosted: Sun Nov 22, 2020 4:07 pm 
Old School Hero

Joined: Mon Aug 07, 2017 5:14 pm
Posts: 212
Here it is in all its oily glory, like I said yours for postage if you want it


Attachments:
E3ABED35-0105-4105-8035-DCD3CD7AC2C5.jpeg
E3ABED35-0105-4105-8035-DCD3CD7AC2C5.jpeg [ 80.42 KiB | Viewed 867 times ]
AAFA9637-1358-4688-B9D2-6419C58B0C7C.jpeg
AAFA9637-1358-4688-B9D2-6419C58B0C7C.jpeg [ 129.84 KiB | Viewed 867 times ]
Top
 Profile  
 
PostPosted: Mon Nov 23, 2020 9:49 am 
retrobike rider
retrobike rider
User avatar

Joined: Fri Aug 08, 2008 2:36 pm
Posts: 18980
Location: Yorkshire, England
Southwestslacker1 wrote:
Bad maths, 12-19


?
You mean a 17-19 jump and no 18


Top
 Profile  
 
PostPosted: Mon Nov 23, 2020 10:57 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 10421
Location: New Forest, UK
The other solution is to crack open 8 or 9 speed cassettes - reuse the 7 speed spacers and harvest the sprockets you need. The sprockets are all the same thickness.


Top
 Profile  
 
PostPosted: Tue Nov 24, 2020 2:11 pm 
Old School Hero

Joined: Mon Aug 07, 2017 5:14 pm
Posts: 212
FluffyChicken wrote:
Southwestslacker1 wrote:
Bad maths, 12-19


?
You mean a 17-19 jump and no 18


Top
 Profile  
 
PostPosted: Fri Nov 27, 2020 10:42 pm 
Dirt Disciple

Joined: Tue Apr 15, 2014 5:44 pm
Posts: 51
hamster wrote:
The other solution is to crack open 8 or 9 speed cassettes - reuse the 7 speed spacers and harvest the sprockets you need. The sprockets are all the same thickness.

Similar thickness, but not the same! see Sheldon Brown spacing data.


Top
 Profile  
 
 Post subject: Re:
PostPosted: Sun Nov 29, 2020 6:15 pm 
Retro Guru
User avatar

Joined: Sun May 05, 2013 12:12 pm
Posts: 2599
Location: Bournemouth
If the OP still wants one, I’ve just removed a very low wear Shimano close ratio cassette - will check size later if it’s still wanted.


Top
 Profile  
 
PostPosted: Mon Nov 30, 2020 9:41 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 10421
Location: New Forest, UK
fastpedaller wrote:
hamster wrote:
The other solution is to crack open 8 or 9 speed cassettes - reuse the 7 speed spacers and harvest the sprockets you need. The sprockets are all the same thickness.

Similar thickness, but not the same! see Sheldon Brown spacing data.


https://www.sheldonbrown.com/cribsheet-spacing.html

7 speed is 1.8mm for 7 and 8s, 1.78mm for 9s.
10 speed is 1.6mm

As 7s uses plastic spacers which compress with tightening then its all within tolerances. The total of 0.12mm difference for the stack height using 9 speed sprockets is not detectable.

OK, to be completely pedantic it's not the same thicknes for 9 speed, but exactly how many microns tolerance do you need?


Top
 Profile  
 
PostPosted: Mon Nov 30, 2020 4:08 pm 
retrobike rider
retrobike rider
User avatar

Joined: Fri Aug 08, 2008 2:36 pm
Posts: 18980
Location: Yorkshire, England
hamster wrote:
fastpedaller wrote:
hamster wrote:
The other solution is to crack open 8 or 9 speed cassettes - reuse the 7 speed spacers and harvest the sprockets you need. The sprockets are all the same thickness.

Similar thickness, but not the same! see Sheldon Brown spacing data.


https://www.sheldonbrown.com/cribsheet-spacing.html

7 speed is 1.8mm for 7 and 8s, 1.78mm for 9s.
10 speed is 1.6mm

As 7s uses plastic spacers which compress with tightening then its all within tolerances. The total of 0.12mm difference for the stack height using 9 speed sprockets is not detectable.

OK, to be completely pedantic it's not the same thickness for 9 speed, but exactly how many microns tolerance do you need?


Enough for a centeron guide pully to not max out, (but hence the name of Shimano's top pulley) Not used in 10sp + setups ??


Top
 Profile  
 
PostPosted: Fri Dec 18, 2020 8:07 pm 
Old School Hero

Joined: Fri May 17, 2013 12:25 pm
Posts: 217
I have a virtually unused 13-21 7 speed cassette if that is of any interest. It is a hyperglide type. I would accept £15 including postage. Let me know :)


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 29 posts ]  Go to page Previous  1, 2, 3

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 18 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group