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


Go Back   > >

Recreational Cyclocross and Gravelbiking This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like :The Dirty Kanza". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 04-24-05, 01:19 PM   #1
CycloneRunner
Junior Member
Thread Starter
 
Join Date: Apr 2005
Bikes:
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I am about to purchase an '05 Axis and was after riding a floor model and reading up on the poor drivetrain it has, I was thinking of an upgrade to make it more cross-race worthy... Here's what I was thinking...

Crank --> FSA Compact Cross 38/48, Platinum BB (double cset, stock Sugino bl*ws)
XT Rear Der --> Upgrade to Ultegra 6500 short-cage (short cage will shift better)
Casette --> Upgrade to Ultegra 9spd 12-25 (cross sizing)

My biggest concern is if I switch the cassette and crank right now (but not the der) will they run well w/ the XT rear der? Or do I should I switch out that part as well? I'm not sure how the XT will throw around a chain on 38/48 double crank w/ a 12/25 cassette.

Backround... I'm doing this b/c I can't afford to step up to the Cross Veloce but I can get a good deal on any Bianchi. Going to ride mostly a 20 min. commute, road cross-training miles (I'm a highly competitive runner), and a few road and 'cross races.

Last edited by CycloneRunner; 04-24-05 at 07:11 PM.
CycloneRunner is offline   Reply With Quote
Old 04-24-05, 07:52 PM   #2
dessert1st
Neophyte
 
Join Date: Jan 2004
Location: Bay Area, CA
Bikes: Well, there's 9 of them
Posts: 78
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The XT rear derailleur actually shifts quite well. If money is an issue don't bother upgrading it. And yes, the rear derailleur will work well with a 12-25 cassette. I even use an 11-21 on my sister's bike with the same derailleur and the shifting is crisp.

In the past the Axis did come with a rather mediocre Sugino crank. It can be pretty flexy especially for a strong rider.
dessert1st is offline   Reply With Quote
Old 04-24-05, 09:00 PM   #3
CycloneRunner
Junior Member
Thread Starter
 
Join Date: Apr 2005
Bikes:
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for the advice. Like I said, I was suspect about the crank. I'll probably just end up swapping out into a 105 or ultegra cassette (12-25) and up the crank to a Truvativ Elita Cross or FSA Gossamer Cross.
CycloneRunner is offline   Reply With Quote
Old 04-25-05, 07:03 AM   #4
mgwadz
Senior Member
 
Join Date: Jul 2004
Bikes:
Posts: 80
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by CycloneRunner
I am about to purchase an '05 Axis and was after riding a floor model and reading up on the poor drivetrain it has, I was thinking of an upgrade to make it more cross-race worthy... Here's what I was thinking...

Crank --> FSA Compact Cross 38/48, Platinum BB (double cset, stock Sugino bl*ws)
XT Rear Der --> Upgrade to Ultegra 6500 short-cage (short cage will shift better)
Casette --> Upgrade to Ultegra 9spd 12-25 (cross sizing)

My biggest concern is if I switch the cassette and crank right now (but not the der) will they run well w/ the XT rear der? Or do I should I switch out that part as well? I'm not sure how the XT will throw around a chain on 38/48 double crank w/ a 12/25 cassette.

Backround... I'm doing this b/c I can't afford to step up to the Cross Veloce but I can get a good deal on any Bianchi. Going to ride mostly a 20 min. commute, road cross-training miles (I'm a highly competitive runner), and a few road and 'cross races.

I would think that over time, as the chain wears the shifting with the XT will degrade a lot faster than with the ultegra. the spacing between the chain pulley and the cassette will be greater with the XT, since it is designed to accomodate up to a 34 tooth cassette (instead of 27-29 max for ultegra).

as the chain wears it becomes more flexible sidewise. a tight spacing with ultegra (or other road derailleur) means it deflects the chian at a greater angle. if you combine a worn chain with wide spacing between cassette and pulley, then the deflection may not even be enought to prompt a shift.

I have used XT with a 12-25 or 12-27 cassette, so I am not saying it can't work. but in the long run I do think it's likely that the shifting won't be as good and could end up being a lot worse as the chain wears.

but since you already have XT you could try it and see how it works for you.

Another downside to having a ling pulley cage is that it's more likely to get damaged the longer it is.
so, having one only as long as you need makes sense to me.

i'm not sure what sort of hookup you have. but maybe the shop will do the changes for you as part of the purchase. that way you don't waste a lot of money changing out perfectly good parts and you can get the setup you want.

marc
mgwadz 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 10:10 AM.