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 11-11-08, 01:07 AM   #1
i86o
.
Thread Starter
 
i86o's Avatar
 
Join Date: Jun 2007
Bikes:
Posts: 155
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
large cassette= chunky shifting?

i was thinking of switching from a 12/25 105 9spd to a 11-32 or 11-34 type cassette while running a single 42 up front on a long cage 105 derailleur and 105 brifter

will this give me some nasty shifts? i don't mind a slight difference but i don't want to switch if this is going to be cumbersome or slow
i86o is offline   Reply With Quote
Old 11-11-08, 02:39 AM   #2
scattered73
Justin
 
scattered73's Avatar
 
Join Date: Jan 2007
Location: Bayou City
Bikes: Soma Double Cross, KHS Urban Uno
Posts: 1,051
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I tried an 11-32 and really didn't like all the chain slack but I was running a double not a single. I never found the shifting cumbersome or slow infact the spring action seemed a little more stout with the xt rd than my ultegra rd if I remember right. Mainly having that kind of range in houston was silly for me with a double don't know why I did that really.
scattered73 is offline   Reply With Quote
Old 11-11-08, 10:39 AM   #3
Andy_K 
Senior Member
 
Andy_K's Avatar
 
Join Date: Jan 2008
Location: Beaverton, OR
Bikes: 2013 Kona Jake, 2015 Kona Jake the Snake, 2008 Kona Major Jake, 2013 Kona Jake the Snake, 2006 Kona Kula, 2012 Ridley Excalibur, 2008 Surly Long Haul Trucker, 2001 LeMond Buenos Aires, 1984 Pinarello Gran Turismo, 1982 Trek 614, 1979 Austro-Daimler
Posts: 8,541
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 57 Post(s)
I switched from a 12-25 to an 11-32 for some road rides this summer. It accomplished what I wanted, which was to get my sorry butt over some big climbs, but on the whole it slowed me down. The reason is that when you shift up, it drops you outside the efficient cadence range, and you have to work hard for a few seconds to get back up to a good spin. And it does that for every shift.

The questions you need to ask yourself are, (1) how often are you going to use a gear with more than 25 teeth, and (2) is it worth having to use a long cage derailleur to get that?
Andy_K is offline   Reply With Quote
Old 11-11-08, 03:15 PM   #4
Milice 
Senior Member
 
Milice's Avatar
 
Join Date: Oct 2004
Location: Ohio
Bikes:
Posts: 1,324
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by i86o View Post
i was thinking of switching from a 12/25 105 9spd to a 11-32 or 11-34 type cassette while running a single 42 up front on a long cage 105 derailleur and 105 brifter

will this give me some nasty shifts? i don't mind a slight difference but i don't want to switch if this is going to be cumbersome or slow
This is allmost the same teh same set up that I am using, only I am using a Sora rear no problems whatsoever.
__________________
If it looks like the $3000 bikes but costs less than a decent helmet, it probably isn't a wise investment.


http://keith-crossreference.blogspot.com/
Milice is offline   Reply With Quote
Old 11-11-08, 07:34 PM   #5
pwdeegan
smitten by саша
 
pwdeegan's Avatar
 
Join Date: Sep 2008
Location: Eugene, OR
Bikes: Salsa La Cruz with Rohloff; mutt parts
Posts: 525
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i run an 11-34 with 48 chainring (1x9 speed); and i *love* it. no problems with cadence at all, from 34 all the way to 11. there might be some issue with terrain, but here in hilly mid-state NY i can cruise in the upper registers most of the time, but still maintain a more consistent cadence on the hills/little mountains. i see spandex road warriors grunting as they slowly snail their way up the big hills pedal-over-pedal (<60rpm), while i match their speed with about twice the cadence (which gives me the sensation of more stability and control at the slower speeds). and at the worst hill sections---that most rotten of 30-50ft---i am spinning at about 60rpm; i've not seen a road biker on those sections, ever (maybe just the super-dooper monster thigh bikers try it, i don't know).
pwdeegan is offline   Reply With Quote
Old 11-12-08, 02:37 PM   #6
cachehiker
Soma Lover
 
Join Date: Dec 2004
Location: Logan, UT
Bikes: one bike for every day of the week
Posts: 765
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Think I'd prefer an XT mid-cage RD. I haven't tried to shift anything larger than a 11-28 with a road double and it was temperamental. I'd heard it would be fine with up to an 11-30 and sometimes 11-32. However, when I adjusted the B-screw to shift the big cogs well, the small ones were sluggish. If I adjusted it for better shifting of the small cogs, the big ones ghost shifted. I went back to my 11-26 climbing cassette after the one sick climb I made the change for. With the mid-cage on the cross bike I've been able to swap between 11-28, 11-32, and 11-34 with no problems at all.
cachehiker is offline   Reply With Quote
Old 11-12-08, 03:34 PM   #7
stapfam
Time for a change.
 
stapfam's Avatar
 
Join Date: Jan 2004
Location: 6 miles inland from the coast of Sussex, in the South East of England
Bikes: Dale MT2000. Bianchi FS920 Kona Explosif. Giant TCR C. Boreas Ignis. Pinarello Fp Uno.
Posts: 19,915
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I use 11/32 on the MTB and this is standard gearing for most MTB's now. I have never had clunky changes- unless the derailler needs adjusting. Changes are instant and clean- even when the cassette and derailler are covered in mud.

But the annoying thing is- I can climb hills with 24/28 on the "OLD" so why do I need 22/32 with the newer bike on the same hills?

If you have lower gears- you will use them. Might not need them- but you will use them.
__________________
How long was I in the army? Five foot seven.


Spike Milligan
stapfam is offline   Reply With Quote
Old 11-13-08, 01:31 AM   #8
Andy_K 
Senior Member
 
Andy_K's Avatar
 
Join Date: Jan 2008
Location: Beaverton, OR
Bikes: 2013 Kona Jake, 2015 Kona Jake the Snake, 2008 Kona Major Jake, 2013 Kona Jake the Snake, 2006 Kona Kula, 2012 Ridley Excalibur, 2008 Surly Long Haul Trucker, 2001 LeMond Buenos Aires, 1984 Pinarello Gran Turismo, 1982 Trek 614, 1979 Austro-Daimler
Posts: 8,541
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 57 Post(s)
Let me explain what I think the issue is with the 11-32+ cassettes and the wider gear spacing. It isn't something that feels obviously wrong. It's a matter of efficiency.

My maximum efficiency is at a cadence of around 90-100. When I get to about 105, I shift up. If I'm using an 11-32 cassette, that upshift typically drops me down to a cadence of about 80. If I'm using a 12-25 cassette, it typically only drops me to about 90.

Now a cadence of 80 doesn't feel wierd. It's fairly normal. But it's not as efficient as 90, and so I have to work harder to get back into the sweet spot. With the tighter gear spacing, I stay in the sweet spot. The effect is, when my shift takes me to 80, it feels like the bike wants to stay at the current speed, and I have to work to make it do otherwise. When the shift takes me to 90, the bike feels like it wants to go faster.

Obviously in a 'cross race there are all kinds of things that tend to force your cadence down independent of gearing. On the road, the above argument is much more direct. Nevertheless, I think that the net effect of tighter gearing is more efficient acceleration through the range. The cost, of course, is a smaller range.

Mountain bikes use the wider range, because mountain bike riding requires it -- lots of ascents and descents. Road bikes use tighter spacing because the focus is one being able to accelerate efficiently through the range. I would argue that in this respect cyclocross is more like road than mountain.
Andy_K is offline   Reply With Quote
Old 11-13-08, 08:28 PM   #9
akaio
Senior Member
 
akaio's Avatar
 
Join Date: Oct 2006
Location: NYC!
Bikes: Jamis Sputnik (2007) & Bridgestone RB-2 (1994).
Posts: 382
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I plan on doing a similar thing for my touring bike next summer. Which I plan on having one chain ring, have a lot of gear in my pannier and riding up some large mountains.

I think for a cross race bike 11-34 is unnecessary. If you are using a gear that big in the back you could probably run the bike faster.
akaio 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 08:11 PM.