Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Touring Have a dream to ride a bike across your state, across the country, or around the world? Self-contained or fully supported? Trade ideas, adventures, and more in our bicycle touring forum.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 01-25-06, 11:51 PM   #1
rmwun54
Senior Member
Thread Starter
 
Join Date: Apr 2004
Bikes:
Posts: 898
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Upgrading a road triple chainrings?

Where can I find on the net a company that carries smaller rings for the granny gear and the middle ring on a Shimano road triple. I looking to alter my triple from a 52-42-30 to a 52-38-24 in black. Has anyone done something like this? Looking for the parts on the net. Thanks to those who respond.
rmwun54 is offline   Reply With Quote
Old 01-26-06, 01:14 AM   #2
Camel
Caffeinated.
 
Camel's Avatar
 
Join Date: Aug 2004
Location: Waltham, MA
Bikes: Waterford 1900, Quintana Roo Borrego, Trek 8700zx, Bianchi Pista Concept
Posts: 1,541
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Black may be a problem (may not be?).

Check Harris Cyclery online (Google).
Camel is offline   Reply With Quote
Old 01-26-06, 01:30 AM   #3
vosyer
WATERFORD22
 
Join Date: Oct 2005
Location: Seattle
Bikes: Bilenky, Co-Motion, 1969 Paramount, Waterford Adventure Cycle, Waterford rs 22, 1980 Davidson etc.
Posts: 509
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
TA rings - look on line for Peter White, another option are OR campy rings if you can find them
vosyer is offline   Reply With Quote
Old 01-26-06, 01:47 AM   #4
seeker333
__________
 
seeker333's Avatar
 
Join Date: Feb 2004
Bikes: yes!
Posts: 3,168
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
can you do that? most shimano f der for triples have 22t capacity.

Last edited by seeker333; 01-26-06 at 01:53 AM.
seeker333 is offline   Reply With Quote
Old 01-26-06, 03:24 AM   #5
MichaelW
Senior Member
 
Join Date: Feb 2001
Location: England
Bikes:
Posts: 12,932
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
With a 52 ring you may find that the mid-granny shift is poor with occasional de-chaining onto the bottom bracket shell. As the chain is moved down by the mech it is also moved inboard.
The solution is a smaller big ring and a lowered front mech.

TA make some of the best rings for touring, very hardwearing and the shift is OK. If you really insist on black chainrings then Egg rings are pretty similar to TA.
MichaelW is offline   Reply With Quote
Old 01-26-06, 07:35 AM   #6
velonomad 
Older I get, Better I was
 
velonomad's Avatar
 
Join Date: Nov 2003
Location: Greenfield Lake, Wilmington NC
Bikes: '14 BD Lurch Fatbike, '10 custom road,'06 custom expedition, '94 Yokota Tandem, '88 custom MTB
Posts: 1,715
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 15 Post(s)
I don't think you will get the 24 tooth to work very well. A friend tried it and the chain wouldn't clear the cage brace. he managed to get a 28T to work however
velonomad is offline   Reply With Quote
Old 01-26-06, 01:10 PM   #7
lillypad
lillypad
 
Join Date: Jan 2006
Bikes:
Posts: 131
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yeah, unless you have a touring set-up to begin with with front and rear derailleurs designed for such large teeth ranges you will probably not be able to get it to work.

24T is really small - usually reserved only for mountain bikes where the rider is leaning on the handlebars trying to keep the front wheel on the ground. I did a transcontinental bike ride coming through the cascades and the appalachians and made it just fine with my 30-42-50 combination. Your cadence may be a little slower with the 30T but there probably isn't any paved road that you cannot traverse with it.

Last edited by lillypad; 01-26-06 at 02:23 PM.
lillypad is offline   Reply With Quote
Old 01-26-06, 04:32 PM   #8
challengea2z
In planning
 
Join Date: Jan 2006
Bikes: Revell custom tourer,Kona Stinky,Omega TI,Gaint TCR,Simonchinni,Raliegh ti,S&M Next Gen.
Posts: 81
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
TA rings are the way to go and by the way Campag don't fit Shimano you spread of rings is to big make your 52 a 50 and get a casette with a 11t as you'll need to change that and you chain if your rings are worn out.
challengea2z is offline   Reply With Quote
Old 01-26-06, 05:54 PM   #9
wagathon
Banned
 
wagathon's Avatar
 
Join Date: Apr 2005
Bikes:
Posts: 1,727
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You might consider putting on a XT/XTR triple, e.g., 22/32/46 or 24/34/48 and going with a smallish cluster--depending on how low a gear you want--such as 12-25 or 12-27, etc.

All you'd be giving up is a gear that is higher than a 46x12 or 48x12 but maybe you need that. For me, I have seldom had the need for the big 52 or 53T ring on any of the road bikes that I've ridden, except maybe to peddle like crazy down a big downhill just because I could. I once had an 11T sprocket on a cluster and that is nuts.

Something to consider; otherwise, teaming up a 12-32 cluster with your current triple provides a 30x32 low gea. That provides a gear that is less that 1-to-1 but you give up having closely-spaced gears. Still, it's been my experience that the spacing is not bad if you have, e.g., a 9-spd cluster.
wagathon is offline   Reply With Quote
Old 01-26-06, 09:05 PM   #10
rmwun54
Senior Member
Thread Starter
 
Join Date: Apr 2004
Bikes:
Posts: 898
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Well here is the deal I have a FSA road triple with 53-39-26 set up with a 12-34 cassette and it works excellent and without any glitch. Of course I am using XT shiftres and derraileurs too. My friend who I am doing this for wants a similar set up as mine but needs a 24 granny for the uphill. Yeah this sounds a bit much to do, but the reason why we have our bike set up like this is because it was my dream to have a all around bike that could be ridden quite fast on various conditions on the street and bike path, and then also at the same time have the capability to be ridden up on a fire road like a mountain bike. So I came up with this bike where I took a Giant OCR touring frame and placed a 29'er shock fork on it, a converted road triple, full XT components, a Rock Shox seatpost, and 700x32c WTB Cross wolf tires. And this bike rocks, whether riding on the road or fire roads this bike can do it all. So my friend like's this set up as much as I do, but hew needs just a little more grearing to make it up the hill. So I am just looking to see if anyone has ever done a 24 chainring before on a road triple, that's all.
Attached Images
File Type: jpg Picture 00042.jpg (43.7 KB, 15 views)

Last edited by rmwun54; 01-26-06 at 09:17 PM.
rmwun54 is offline   Reply With Quote
Old 01-26-06, 09:43 PM   #11
wagathon
Banned
 
wagathon's Avatar
 
Join Date: Apr 2005
Bikes:
Posts: 1,727
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by rmwun54
. . .So I am just looking to see if anyone has ever done a 24 chainring before on a road triple, that's all.
Yup, I have 22-32-46 rings on a road bike but with a 12-27 10-spd freewheel. Your setup gives you a ~0.76 low gear ratio compared to my 0.81. It is fun having a goat in the stable. As a all-around road bike, I generally never leave the middle ring but I did have an opportunity to use the low gear on a pedestrian path that was steep enough to be doing stairs and it worked great.
wagathon is offline   Reply With Quote
Old 01-26-06, 09:49 PM   #12
Michel Gagnon
Year-round cyclist
 
Join Date: Apr 2002
Location: Montréal (Québec)
Bikes:
Posts: 3,023
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
As one said, "24 is small", but my single has a 22 on a mountain crankset and I use it. It may be slower than standing on the pedals, but I get up steep hills without problems.

With bar-end shifters (i.e. front is in friction), I use 44-34-22 on the touring bike. On the tandem, I had 48-38-24, and the derailleur covers a wide enough range to easily shift through 52-40-24 or 52-38-24. The tandem now uses a 48-38-28-18 quad, and again, no problems with the 105 derailleur.

With STI or any other indexed front shifter, I heard of a fair number of people using a wide range triple more or less like what you suggest. The only problem they have is that they strongly recommend using a gizmo like the Jump stop to keep the chain on the small ring.

Another problem is that with a 12-34 cassette and 52-38-24 rings, you may be beyond the capacity of your rear derailleur. That would result in a loose chain in the small-small combo; however, since one never uses it, it's not a real problem.

P.S. I often read that Shimano road derailleurs are optimised for 10 to 12 teeth between middle and large ring, and that too large a gap would make shifting more difficult. Is it a real issue or not in a touring environment? Is it a problem with STI?
Michel Gagnon is offline   Reply With Quote
Old 01-26-06, 10:04 PM   #13
rmwun54
Senior Member
Thread Starter
 
Join Date: Apr 2004
Bikes:
Posts: 898
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thank you Michael for the input, I like the idea of the jump stop gizmo, didn't know it exist before. That will work and will be insuring at that.
rmwun54 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 10:18 PM.