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 07-24-09, 12:24 AM   #1
kristian009
Newbie
Thread Starter
 
Join Date: Jun 2009
Location: dallas tx
Bikes: 2008 schwinn madison fixie/single speed. 85 maruishi rx7 roadie, mid restore. 1975 Fuji special road racer.
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
12 speed sti compatibility question

hi there, i have a Maruishi Rx-7, 12 speed, double chain ring, downtube shifters. it's apart for restoration, and i'm replacing a few parts, and i only want to spring for one good pro build once i purchase all the parts i want, i was wondering if it was possible to put STI on this bike? would a 5 speed cassette effectively render this bike 10 speed, and able to take 10 speed shimano sti? i'm looking at a set in the $175 dollar range on ebay. level with me, even if possible, is it worth it to go sti on vintage cromo frame bike?
note, not my bike, but same model. mine is a little beat, but being fixed up.
kristian009 is offline   Reply With Quote
Old 07-24-09, 01:07 AM   #2
johnknappcc
Senior Member
 
johnknappcc's Avatar
 
Join Date: Feb 2009
Location: Columbus, OH
Bikes: A beautiful columbus steel frame, 1986 Schwinn Voyageur touring bike, Currently Undergoing Overhaul
Posts: 910
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
No, 10 speed means 10 cogs in back. It's the spacing and number of the cogs that make it compatible. You could respace your frame to 130mm, get a new wheelset that accepts a cassette, put a 10 speed cassette on, get a new chain, new cranks (new bottom bracket to support it), and obviously the brifters.

By my, and many others calculations, done right (decent components, not half-assing the work), you would be looking at a thousand dollar investment, assuming you do the work yourself. Lots of people have done it, but unless you really really really like your bike, or find some amazingly good deals, you may be better off getting a new bike.

So, is it worth it? That's a call only you can make . . .
johnknappcc is offline   Reply With Quote
Old 07-24-09, 01:11 AM   #3
Metzinger
Primate
 
Metzinger's Avatar
 
Join Date: Jan 2006
Location: gone
Bikes: Concorde Columbus SL, Rocky Mountain Edge, Sparta stadfiets
Posts: 2,582
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by johnknappcc View Post
So, is it worth it? That's a call only you can make . . .
Incorrect. I'll gleefully make that call.
No.
And I didn't even break a sweat.
Metzinger is offline   Reply With Quote
Old 07-24-09, 02:21 AM   #4
kristian009
Newbie
Thread Starter
 
Join Date: Jun 2009
Location: dallas tx
Bikes: 2008 schwinn madison fixie/single speed. 85 maruishi rx7 roadie, mid restore. 1975 Fuji special road racer.
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
ok. this was the kind of info i was looking for. i'll enjoy this bike with downtube shifters and save up for a more modern roadie. i got into roadbikes recently, from fixed and singlespeed riding, and have been cutting my teeth on vintage finds. looking forward to someday soon having a legit new roadie. any entry level recommendations?
kristian009 is offline   Reply With Quote
Old 07-24-09, 08:39 AM   #5
Gonzo Bob
cycles per second
 
Gonzo Bob's Avatar
 
Join Date: Oct 2003
Location: Minnesota
Bikes: Vitus Aluminum, DiamondBack Apex, Softride Powerwing 700, "Generic" Ishiwata 022, Trek OCLV 110
Posts: 1,790
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It looks like the bike is SIS compatible (Shimano Indexed System rear derailer) so an STI conversion can probably be done.

If the rear hub is a cassette hub, it is Uniglide (there never was 6-speed Hyperglide) and you can't really find 7-speed Uniglide cassettes anymore. You could convert to a Hyperglide freehub, though, for about $20 or $30. You would then need a 7-speed Hyperglide cassette.

If it's a freewheel hub, get a 7-speed Shimano freewheel. They are still made but selection isn't the greatest.

Get Shimano Sora 7-speed STI shifters. These seem to be out of stock everywhere I've looked so you are SOL on this conversion unless you can find them http://www.bikeparts.com/productsear...7-Speed%20Sets

Last edited by Gonzo Bob; 07-24-09 at 08:42 AM.
Gonzo Bob is offline   Reply With Quote
Old 07-24-09, 12:41 PM   #6
Al1943
Senior Member
 
Join Date: Feb 2005
Location: Oklahoma
Bikes: Trek 5500, Colnago C-50
Posts: 9,433
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by kristian009 View Post
ok. this was the kind of info i was looking for. i'll enjoy this bike with downtube shifters and save up for a more modern roadie. i got into roadbikes recently, from fixed and singlespeed riding, and have been cutting my teeth on vintage finds. looking forward to someday soon having a legit new roadie. any entry level recommendations?
That's a good decision. Ride it as is and save for a new road bike.
A good fit is the most important part of buying a bike.
Al1943 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 03:21 AM.