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 10-24-06, 11:17 AM   #1
b*money
Member
Thread Starter
 
Join Date: Jul 2006
Location: San Francisco, CA
Bikes: K2 - Mach 1.0
Posts: 33
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Bianchi Sport SX - 27inch to 700C Conversion

Hey Everyone...

I just bought a 70's (I think) 67cm Bianchi Sport SX.

This has the original wheels, and needless to say they, as well as most of the other components are a little torn up. Rather than try and track down a satisfactory set of 27inch wheels (I am looking for black rims with black and red tires to go with the paint job) I decided to look into how difficult it would be to convert this to 700c wheels.

Someone told me I would have to redrill my frame, which I am a little wary of trying. What about long reach brakes? Would be able to just get some long reach brake calipurs and be done with it? Or I also have heard of a drop bolt you can put in to lower the brakes. How complicated is that, and where can I find one?

I am looking to go from a 6 speed friction shifting 27inch wheel bike, to a 7 speed index shifting 700c wheel bike. (with all matching red and black parts if possible)

I assume I will be needing new front and rear derailleurs, wheels, tires, chain, and shifters. Am I missing anything else?

Thanks for all the info everyone!!!
b*money is offline   Reply With Quote
Old 10-24-06, 12:27 PM   #2
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 29,108
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 174 Post(s)
Look at the current brake pad location. Can you lower them 4 mm? If so, you can use 700c wheels with no changes. I expect the bike already has "long reach" (typically 47 to 57 mm) brakes so that's probably not a change option.

Drop bolts are (or at least used to be) available but will take some searching. Check Sheldon Brown's web site for what ever wisdom he can provide. You DON'T want to "redrill" the frame or fork.

As to needed parts, what's the condition of the current headset and bottom bracket?

By the time you fit all of the new parts you listed the cost will be a very significant fraction of a new bike. Be sure the frame has that much worth to you.
HillRider is offline   Reply With Quote
Old 10-24-06, 12:56 PM   #3
b*money
Member
Thread Starter
 
Join Date: Jul 2006
Location: San Francisco, CA
Bikes: K2 - Mach 1.0
Posts: 33
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Headset is in good condition, BB and Crank were replaced on the spot when I bought it. The brakes definately need replacing. I am not sure about the derailleurs however.

I am not really set on the 7 speed idea because the extra gear isn't really important, it really comes down to what is easiest to pull off.
b*money is offline   Reply With Quote
Old 10-24-06, 01:00 PM   #4
SaabFan
The AVatar Ninja
 
SaabFan's Avatar
 
Join Date: Aug 2006
Bikes:
Posts: 609
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The easiest to pull off will be whatever components you can find the cheapest!

Even if it already has "long reach" calipers on it, some manufacturers have made SUPER long reach calipers. Keep an eye on eBay. I've seen calipers from Tektro that have reach up to 78mm. Here's an eBay auction:

http://cgi.ebay.com/TEKTRO-LONG-LONG...em230041499937
SaabFan is offline   Reply With Quote
Old 10-24-06, 01:39 PM   #5
well biked 
biked well
 
well biked's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 7,123
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 38 Post(s)
If you end up needing more brake reach than you can find with sidepull road calipers, you might look into some centerpull road brakes (they'll mount at the same holes on your fork and seatstay bridge that your current brakes do). Do a search on ebay for "centerpull brakes", you'll probably find lots of them, some NOS maybe. Weinmanns and Dia-Compes are the most common and work great. Setup is a bit of a pain, but if you need lots of reach for an old road bike, they're hard to beat-
well biked is offline   Reply With Quote
Old 10-24-06, 01:48 PM   #6
Grand Bois
Senior Member
 
Grand Bois's Avatar
 
Join Date: Mar 2005
Location: Pinole, CA, USA
Bikes:
Posts: 16,819
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 130 Post(s)
You can find seven speed cassette wheelsets pretty cheap on eBay because the demand is low. I just bought a set with Mavic MA-40 rims, butted spokes, 600 hubs, a good Ultegra cassette, very good Continental tires and tubes, Velox rim tape and the original skewers for $45. They're true and the cones show almost no wear. Even with shipping, it's a bargain.
Grand Bois is offline   Reply With Quote
Old 10-24-06, 03:08 PM   #7
b*money
Member
Thread Starter
 
Join Date: Jul 2006
Location: San Francisco, CA
Bikes: K2 - Mach 1.0
Posts: 33
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I was poking around and found both Nashbar, and Tektro have long reach brakes. If I slap some better brake pads on these, how well will they work compared to the Shimano ones that are 3 times the price?
b*money 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 05:53 AM.