HOT: Active* forum members generally gain 5% discount at starbike.com store!
Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Articles FAQ Contact About




Post new topic Reply to topic  [ 26 posts ] 
Go to page 1, 2  Next
Author Message
 Post subject: 39 x 25T
PostPosted: Mon Apr 02, 2012 7:40 pm 
Offline

Joined: Wed Dec 07, 2011 1:26 am
Posts: 414
Location: California's country side
Does anyone use this chainring and cassette combo?

I found it difficult to climb when grades exceed 12%, maybe it's a technique thing, the grade pitches up to 16% and it was pure torture. I was going so slow and was fairly sure it went faster with a compact.


Top
 Profile  
 
 Post subject: Re: 39 x 25T
PostPosted: Mon Apr 02, 2012 7:47 pm 
Offline
Formerly known as wassertreter

Joined: Tue Apr 12, 2011 8:08 am
Posts: 2017
Location: Pedal Square
16% on that sounds like torture indeed. Around here most people are running 34x27 to cope with those gradients up to 20%. Also it's nice to spin uphill, at least in training :D

_________________
Bikes: Raw Ti, 650b flatbar CX


Top
 Profile  
 
 Post subject: Re: 39 x 25T
Posted: Mon Apr 02, 2012 7:47 pm 


Top
  
 
 Post subject: Re: 39 x 25T
PostPosted: Mon Apr 02, 2012 7:54 pm 
Offline
User avatar

Joined: Mon Jan 23, 2006 6:35 am
Posts: 5020
Location: New York
A. You need some fitness build up so get fit on the 10% or less grades first
B. Here is a gear calculator to help you determine the best gear vs rpm vs speed http://www.gear-calculator.com/#
C. Good luck!

_________________
I never took drugs to improve my performance at any time. I will be willing to stick my finger into a polygraph test if anyone with big media pull wants to take issue. If you buy a signed poster now it will not be tarnished later. --Graeme Obree


Top
 Profile  
 
 Post subject: Re: 39 x 25T
PostPosted: Mon Apr 02, 2012 11:21 pm 
Offline

Joined: Sun Apr 24, 2011 6:23 am
Posts: 643
Location: Melbourne, Australia
I run 39x23. :wink:

_________________
Slam your stem.


Top
 Profile  
 
 Post subject: Re: 39 x 25T
PostPosted: Mon Apr 02, 2012 11:40 pm 
Offline

Joined: Thu Mar 08, 2012 11:43 pm
Posts: 573
PoorCyclist wrote:
Does anyone use this chainring and cassette combo?

I found it difficult to climb when grades exceed 12%, maybe it's a technique thing, the grade pitches up to 16% and it was pure torture. I was going so slow and was fairly sure it went faster with a compact.


It's not technique, it's just a big gear. I use a 39x25 in an area with quite a few climbs peaking at 20 - 25%, loads peaking at +15% and a few that average 10%+. Quite frankly though, it's not big and it's not clever, it just makes it a damn sight harder and slower overall than it should be! I can't be bothered to spend any more on this one, but my next bike will have different ratios.


Top
 Profile  
 
 Post subject: Re: 39 x 25T
PostPosted: Tue Apr 03, 2012 1:11 am 
Offline

Joined: Tue Nov 11, 2003 9:47 pm
Posts: 1804
Location: Santa Cruz, California, USA
We are lucky to have a lot of big and/or steep climbs in California. Get a compact if you want to enjoy them. You can shift to a higher gear if it doesn't hurt enough.


Top
 Profile  
 
 Post subject: Re: 39 x 25T
PostPosted: Tue Apr 03, 2012 3:15 am 
Offline

Joined: Thu Jul 26, 2007 10:24 pm
Posts: 1571
Location: Center of the Universe
That is what I use. I like to climb. There are some 20+% grades around here but they are relatively short. 1/3 of a mile or so.

_________________
TIME RXR


Top
 Profile  
 
 Post subject: Re: 39 x 25T
PostPosted: Tue Apr 03, 2012 9:30 am 
Offline
Administrator
User avatar

Joined: Sat Jun 19, 2004 11:08 am
Posts: 6291
Location: Urbana, Illinois
39 X 25 is my bailout and when I will be climbing the 11-25 goes on. You are supposed to suffer in the climbs. :shock: :D

_________________
RESIDENT GRUMPY OLD MAN.


Top
 Profile  
 
 Post subject: Re: 39 x 25T
PostPosted: Tue Apr 03, 2012 9:48 am 
Offline

Joined: Mon Mar 19, 2012 3:31 pm
Posts: 459
I can climb a short 12% on the 50, but it better be short! I love my compact, and one day I'l use my 34/29, i just knows it.

What was that Village People song? Macho macho maaaan, I wanna beee, a macho man


Top
 Profile  
 
 Post subject: Re: 39 x 25T
PostPosted: Tue Apr 03, 2012 10:08 am 
Offline

Joined: Tue Jun 22, 2004 11:42 pm
Posts: 3914
Location: lat 38.9677 lon 77.3366
You will be able to climb faster with less fatique using proper climbing gears. Using to steep a gear will just kill your legs. I have a road I climb several times a year, after a increasing grade for the first five miles you hit a sustained grade of 20 percent for two miles with it hitting 24 percent for about a half mile of that and the piss poor road surface just makes it harder. I have done it with a 39x25 and frankly it killed me. My best time was with a 34x29 and I had the legs to climb over the pass three more times that day (118 miles total miles that day). I have found a 12x29 with a 52x36 chainring a great choice for most big climb days. On flats or rollers I do like a 11x23 with a 52x36, not bad but I need to be able to spin a bit faster in a sprint. Look at the gearing in the Giro mountain stages, climbing gears rule!

_________________
WW Velocipedist Gargantuan


Top
 Profile  
 
 Post subject: Re: 39 x 25T
PostPosted: Tue Apr 03, 2012 12:34 pm 
Offline

Joined: Thu Jul 26, 2007 10:24 pm
Posts: 1571
Location: Center of the Universe
Rusty...that hill sounds awesome. Must be a strava segment. Compact sounds like a good choice for that one. Where is that?

_________________
TIME RXR


Top
 Profile  
 
 Post subject: Re: 39 x 25T
PostPosted: Tue Apr 03, 2012 6:04 pm 
Offline

Joined: Mon Mar 19, 2012 3:31 pm
Posts: 459
rustychain wrote:
You will be able to climb faster with less fatique using proper climbing gears. Using to steep a gear will just kill your legs. I have a road I climb several times a year, after a increasing grade for the first five miles you hit a sustained grade of 20 percent for two miles with it hitting 24 percent for about a half mile of that and the piss poor road surface just makes it harder. I have done it with a 39x25 and frankly it killed me. My best time was with a 34x29 and I had the legs to climb over the pass three more times that day (118 miles total miles that day). I have found a 12x29 with a 52x36 chainring a great choice for most big climb days. On flats or rollers I do like a 11x23 with a 52x36, not bad but I need to be able to spin a bit faster in a sprint. Look at the gearing in the Giro mountain stages, climbing gears rule!


Thanks for that; nothing like 24% round my neck of the woods sadly, but nice also to know that the 29 can cope if ever called upon.


Top
 Profile  
 
 Post subject: Re: 39 x 25T
PostPosted: Tue Apr 03, 2012 8:18 pm 
Offline
User avatar

Joined: Sun May 10, 2009 3:31 pm
Posts: 445
Location: Russia, Moscow
Just a small reality check. ;)

Here is how Pros ride up Angliru, where the steepest 6 km (less than 4 miles) average a whooping 13,1%:
http://www.youtube.com/watch?v=ulViOm2P ... ure=relmfu

And gearing they used:
Juanjo Cobo rode 34×32
Nibali 34×29
Kessiakoff 34×28
Fuglsang and Mollema 36×28
Bradley Wiggins and Chris Froome 38×32 asymmetrical front chain

Of course our own WW members, who regularly conquer multi-mile 20% climbs, would have flown up that Spanish hill...


Top
 Profile  
 
 Post subject: Re: 39 x 25T
PostPosted: Tue Apr 03, 2012 8:38 pm 
Offline

Joined: Thu Mar 08, 2012 11:43 pm
Posts: 573
rustychain wrote:
I have a road I climb several times a year, after a increasing grade for the first five miles you hit a sustained grade of 20 percent for two miles with it hitting 24 percent for about a half mile of that and the piss poor road surface just makes it harder.


What is the total elevation gain of the climb, and can you post a graph from one of the mapping sites?

For comparison, this is Monte Zoncolan.

Image


Top
 Profile  
 
 Post subject: Re: 39 x 25T
Posted: Tue Apr 03, 2012 8:38 pm 


Top
  
 
 Post subject: Re: 39 x 25T
PostPosted: Tue Apr 03, 2012 9:03 pm 
Offline

Joined: Mon Mar 19, 2012 3:31 pm
Posts: 459
You would have thunk Bradder's and Froome's DS would have made the mild suggestion to actually recce the most crucial, race deciding climb ahead of last years Vuelta....


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 26 posts ] 
Go to page 1, 2  Next


Who is online

Users browsing this forum: KWalker and 8 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

It is currently Sat Dec 20, 2014 5:43 pm

All times are UTC + 1 hour




Advertising   –  FAQ   –  Contact   –  Convert   –  About

© Weight Weenies 2000-2013
hosted by starbike.com


How to get rid of these ads? Just register!


Powered by phpBB