Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the May Giveaway for DERUIZ LAVA e-bike worth $1699


Upgrading old SIS drivechain
#1
I have brought an old Giant GSR200 (early 90's I would guess), as a hack to use to commute to the station in the morning, and leaved locked all day. I am happy with the condition of the bike, and for a tenner it was a bargin!

The only issue I have is that being so old it has Shimano SIS thumb shifters (the ones on the top of the bars). I would really like to change these as I find them awkward to use, so I started to search around on google for help but now I am confused more (I am very mechanically minded, but have little experience with bikes!).

So far I have established that I have a 6spd rear cassette(?) which is not the cartridge type but the screw on freewheel type and a Shimano SIS rear derailleur. It looks like to change to either gripshift or rapidfire (preferred) will warrent a change to a 7sp at the rear (unless anyone knows of a source of 6sp shifters?). I am happy to do this, but this is where I get lost.

What do I need to know/consider and how to I go about working out if this is possible. Can i change the 6sp for a 7sp cassette/freewheel assembly? Is there a better way to get around this problem?

I'm happy to spend a bit on this (>£50), partly for the experience of making the changes and learning through doing!

Any help would be greatly appreciated!!!
  Reply
#2
They do make 3x6 (18 speed ) grip shifters. Most even come with the grips too. This would be the cheapest way to go. Is the rear shifter an indexed or just friction type?
http://www.ebay.com/itm/SRAM-MRX-Comp-3x6-Grip-Shift-18-Speed-Bike-Twist-Shifter-Set-Cables-fits-Shimano-/221783312949?epid=710130524&hash=item33a350ca35:g:RT8AAOSwxH1T-~rr

The mrx is Shimano indexed compatible
There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"
  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post
 
7,641
08-22-2011, 06:31 AM
Last Post: DaveM
 
12,531
11-29-2009, 08:47 PM
Last Post: thoggard

Forum Jump:

[-]
10 Latest Posts
What are your thoughts on E-bikes?
Today 03:13 PM
How much do you bike a year
Today 07:47 AM
Installed Shimano Zee on GT Transeo 5.0
Yesterday 07:57 PM
E-Bike
Yesterday 02:50 AM
Unknown brand, should I buy or not?
Yesterday 02:01 AM
Trek 2300 Vs Triban RC500 (Buy advice)
Yesterday 01:52 AM
Help with a wheel please !
05-17-2022 08:08 PM
Entry level triathlon bike recs?
05-17-2022 12:59 AM
Have you Ever Tried an Electric Bike?
05-16-2022 07:51 PM
Bobbing seems to make my bike go faster
05-16-2022 07:46 PM

[-]
Join BikeRide on Strava
Feel free to join if you are on Strava: www.strava.com/clubs/bikeridecom

[-]
Top 5 Posters This Month
no avatar 1. Jesper
28 posts
no avatar 2. ReapThaWhirlwind
22 posts
no avatar 3. tran thanh
17 posts
no avatar 4. ichitan
7 posts
no avatar 5. Criminal
5 posts