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 09-12-09, 08:09 PM   #1
chungaroo
Senior Member
Thread Starter
 
Join Date: Aug 2005
Location: Atlanta, GA
Bikes:
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Triple to compact double conversion

I'm thinking of converting my road bike's triple crankset to a compact double crankset, and I'm making a list of things I'll have to buy. Obviously, I would need compact cranks. Would I need a new bottom bracket? My bike currently has a square taper bottom bracket. Also, is the spacing between the two chainrings the same on a compact as it is on a triple? If so, can I use my existing shifter (Shimano 2200 3-speed)? And what about the front derailleur? Will it be compatible?

I tried searching the forums, but I couldn't find a thread that addressed all of these issues.

TIA
chungaroo is offline   Reply With Quote
Old 09-12-09, 08:18 PM   #2
DMF 
Elitist Troglodyte
 
DMF's Avatar
 
Join Date: Jun 2006
Location: Dallas
Bikes: 03 Raleigh Professional (steel)
Posts: 6,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You can do it, but I don't see the point. What are you trying to gain?
__________________
Stupidity got us into this mess - why can't it get us out?

- Will Rogers
DMF is offline   Reply With Quote
Old 09-12-09, 08:18 PM   #3
CollectiveInk
Senior Member
 
CollectiveInk's Avatar
 
Join Date: Jun 2008
Location: Johnson City, TN
Bikes: Specialized Allez Elite / Haro Extreme x6 Expert / Trek 4300
Posts: 216
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yes. Most likely. No. Yes. No. = Short answers.

Longer version.
If you buy the crank new, it'll most likely come with a BB. Just make sure it's english or italian threaded (to match whichever you currently have.) If it doesn't include one, you'll have to buy an appropriate BB. If you shop used, you might be able to find a compact double that takes a square taper. But this is a good time to upgrade to external bearing cups anyways.
Figure a Shimano R600 or R700 - on ebay for $50-100 depending on condition.

The 3 spd shifter should work. You'll just have one unused click.

The front derailleur for a triple is much bigger. It might shift ok, or it might rub the small chain ring. FD are pretty inexpensive. You can get an ultegra or dura ace (if you're shimano) for under $30 on ebay. You'll just need to remember seat tube diameter and get the appropriate clamp size. Or just get a braze on, then you can buy a clamp for whatever seat tube size you put it on.

Lastly.... any reason you're going from a triple to compact? Just curious.
CollectiveInk is offline   Reply With Quote
Old 09-12-09, 08:21 PM   #4
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ask yourself if you really need a compact over a regular double. For the most part they shift like garbage even when perfectly adjusted, and ESPECIALLY if you start mixing and matching different brands.
operator is offline   Reply With Quote
Old 09-12-09, 08:23 PM   #5
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)
I had a triple, went to a compact double (but I did this for a very particular and specific reason) and it probably won't be worth it, if you are just looking to get two chainrings in the front.

Most compacts are going to use outboard bearings, therefore you will need a new bottom bracket (most likely you will have to have your BB shell faced & chased).

The spacing isn't really standardized among any cranks double or triple.

You can probably use your existing shifter, but you won't really know without trying.

On the FD, just get a double, they are cheap. You can "most likely" use your triple, but it won't shift very well. I used mine for a few days while I waited for my double FD to arrive.

Honestly, you aren't going to gain much by going to a compact, I just did it because my triple crank was over 20 years old (designed for a 5 speed setup), and after purchasing chainring spacers, etc, it was just easier to full-on upgrade everything to 10 speed compatible, and I was moving that direction anyway (with every other drivetrain part on my bike).

Hope that helps.
johnknappcc is offline   Reply With Quote
Old 09-12-09, 08:23 PM   #6
chungaroo
Senior Member
Thread Starter
 
Join Date: Aug 2005
Location: Atlanta, GA
Bikes:
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Mostly I just want to become a stronger rider, and I feel like if I don't have so much of the low end, I won't get lazy and use it so much. I also feel like a standard double would be geared way too high for me at my beginner level.
chungaroo is offline   Reply With Quote
Old 09-12-09, 08:27 PM   #7
chungaroo
Senior Member
Thread Starter
 
Join Date: Aug 2005
Location: Atlanta, GA
Bikes:
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Also, the crankset I have my eye on is the FSA Vero (because it's affordable), and it takes a square taper bottom bracket.
chungaroo is offline   Reply With Quote
Old 09-12-09, 08:28 PM   #8
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)
Quote:
Originally Posted by operator View Post
Ask yourself if you really need a compact over a regular double. For the most part they shift like garbage even when perfectly adjusted, and ESPECIALLY if you start mixing and matching different brands.
Really? Mine shifts like butter.
johnknappcc is offline   Reply With Quote
Old 09-12-09, 08:30 PM   #9
DMF 
Elitist Troglodyte
 
DMF's Avatar
 
Join Date: Jun 2006
Location: Dallas
Bikes: 03 Raleigh Professional (steel)
Posts: 6,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by chungaroo View Post
Mostly I just want to become a stronger rider, and I feel like if I don't have so much of the low end, I won't get lazy and use it so much. I also feel like a standard double would be geared way too high for me at my beginner level.
Actually, that's almost reasonable.

But have you tried changing cassettes first? Something like a 11-23?
__________________
Stupidity got us into this mess - why can't it get us out?

- Will Rogers
DMF is offline   Reply With Quote
Old 09-12-09, 08:43 PM   #10
joejack951
Senior Member
 
joejack951's Avatar
 
Join Date: May 2004
Location: Wilmington, DE
Bikes: 1984 Trek 660, 2003 Specialized Hardrock, 2004 LOOK KG386i, 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2014 Islabikes CNOC 14 (son's)
Posts: 9,978
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 77 Post(s)
I was going to suggest swapping out your inner 30 tooth ring for a 34 tooth ring but the only one available in that configuration is made by TA and costs $44. Not really worth it. Go with DMF's suggestion of using a smaller cassette.

Honestly though, you won't get "stronger" simply by not using the granny ring. You'll get stronger by planning out a training program and sticking to it. A crankset in and of itself won't make you work harder on the bike. It might slow down your cadence though if you are trying to push too big of a gear uphill.
joejack951 is offline   Reply With Quote
Old 09-12-09, 09:04 PM   #11
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by chungaroo View Post
Also, the crankset I have my eye on is the FSA Vero (because it's affordable), and it takes a square taper bottom bracket.
The reason why it's cheap is because the FSA rings it comes with shifts like crap. Keep it all shimano or campy or sram. Do not mix garbage in unless you want headaches.
operator is offline   Reply With Quote
Old 09-13-09, 10:16 AM   #12
DMF 
Elitist Troglodyte
 
DMF's Avatar
 
Join Date: Jun 2006
Location: Dallas
Bikes: 03 Raleigh Professional (steel)
Posts: 6,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by joejack951 View Post
A crankset in and of itself won't make you work harder on the bike. It might slow down your cadence though if you are trying to push too big of a gear uphill.
Right. You don't get stronger just by pushing a bigger gear. In fact, it can be counterproductive. It puts most of the work on a single set of muscles - those that push down.

Instead, work on your cadence. Use a lower gear and spin faster, concentrating on pulling on the upstroke. This works the muscles that pull up on the leg and gives you both a more efficient stroke and a better balanced set of power muscles. Then on climbs you can alternate between upstroke and downstroke power to give the other set a break.

Pretty soon you'll find yourself going faster in a bigger gear. All without spending $$.
__________________
Stupidity got us into this mess - why can't it get us out?

- Will Rogers
DMF is offline   Reply With Quote
Old 09-13-09, 01:34 PM   #13
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,543
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 62 Post(s)
Quote:
Originally Posted by operator View Post
Ask yourself if you really need a compact over a regular double. For the most part they shift like garbage even when perfectly adjusted,
I'm thinking that operator must not be talented enough to tell with a compact double is perfectly adjusted. That's too bad.
Retro Grouch is offline   Reply With Quote
Old 09-13-09, 01:39 PM   #14
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,543
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 62 Post(s)
Quote:
Originally Posted by operator View Post
The reason why it's cheap is because the FSA rings it comes with shifts like crap.
FSA Energy compact here. Had it for (I think) 3 years. Octalink BB, Ultegra derailleur, Ultegra shifters. Shifts just fine thank you. I'm thinking you're 0 for 2 on this thread, operator.
Retro Grouch is offline   Reply With Quote
Old 09-13-09, 01:42 PM   #15
CycleBiker
Senior Member
 
Join Date: Feb 2009
Location: St Louis
Bikes:
Posts: 180
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I don't care for triples so on my touring bike with an 11 tooth rear cog my front big chainring is only a 44 which gives me the same gearing as a 52/13, which I figure is just fine for me if it was good enough for Fast Eddie.
CycleBiker is offline   Reply With Quote
Old 09-13-09, 06:16 PM   #16
finnyct90
Daily Rider
 
finnyct90's Avatar
 
Join Date: Jun 2009
Location: Hudson Valley New York
Bikes: way more than I need but not more than I want
Posts: 67
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by DMF View Post
Right. You don't get stronger just by pushing a bigger gear. In fact, it can be counterproductive. It puts most of the work on a single set of muscles - those that push down.

Instead, work on your cadence. Use a lower gear and spin faster, concentrating on pulling on the upstroke. This works the muscles that pull up on the leg and gives you both a more efficient stroke and a better balanced set of power muscles. Then on climbs you can alternate between upstroke and downstroke power to give the other set a break.

Pretty soon you'll find yourself going faster in a bigger gear. All without spending $$.

EXCELLENT POST.....The bike doesn't make the rider!!!
finnyct90 is offline   Reply With Quote
Old 09-13-09, 08:41 PM   #17
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)
If you want to become a stronger rider, ride more hills and more miles. Keep your cadence up, 90 - 105 rpm.
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 09:06 AM.