Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About
It is currently Tue Jul 26, 2016 9:06 pm
Recently the board software has been updated and there are some known bugs/failures:
- Avatars are currently not being displayed ✔ FIXED
- Tapatalk connection is currently broken ✔ FIXED
- Avatars cannot be uploaded ✔ FIXED

Please note that we will soon do some changes in WW board template design in case to get a fully mobile/desktop responsiveness board!
If you find more errors please post it here: http://weightweenies.starbike.com/forum/viewtopic.php?f=7&t=139062


All times are UTC+01:00





Post new topic  Reply to topic  [ 7 posts ] 
Author Message
PostPosted: Wed Jun 26, 2013 4:30 pm 
Offline
User avatar

Joined: Fri Apr 12, 2013 1:19 pm
Posts: 767
Location: South West England
I want to achieve similar gearing as my road bike running 53/39 with 12-22 cassette. I have done the maths comparing to a 12-26 cassette to allow for harder climbs within CX.

So, I have worked out that a 48 chainring with 11-32 cassette will provide the same minimum/maximum ratios as the theoretical road bike.

Would I have any issues running such a gargantuan cassette on a single front ring? i.e. cross chaining or chain length issues. Would I need a mountain bike rear mech?

_________________
Campagnolo; because I ride a bicycle, not a fishing rod.
MASON Definition / Camapgnolo endurance & bikepacking build - ~8.4kg


Top
   
 Post subject:
PostPosted: Thu Jun 27, 2013 12:43 pm 
Offline
Shop Owner

Joined: Sat Jun 13, 2009 4:02 am
Posts: 1980
Location: NoVA/DC
You would need a SRAM wifli or mountain bike (can be short cage) derailleur to guarantee that it will clear the 32t cog. sometimes, a road derailleur will clear, it mostly depends on the derailleur hanger geometry. Some Specialized derailleur hangers are available in a "long" model, for instance.
You don't need a long cage, because you simply don't need to take up that much chain slack in the small cog vs the chain length requirement in the large cog. If you also had two chainrings, that would be a different issue.
You would ideally need a guide of some sort.
If you go Shimano, remember that you need a NINE speed Mtb derailleur for its pull ratio to be compatible with road shifters.

Sent from my EVO using Tapatalk 4 Beta


Top
   
PostPosted: Thu Jun 27, 2013 12:50 pm 
Offline
User avatar

Joined: Fri Apr 12, 2013 1:19 pm
Posts: 767
Location: South West England
So Campag is basically out of the question? Is this more hassle than just using a regular dual setup? I was trying to simplify but it seems it is making things more difficult...

_________________
Campagnolo; because I ride a bicycle, not a fishing rod.
MASON Definition / Camapgnolo endurance & bikepacking build - ~8.4kg


Top
   
PostPosted: Thu Jun 27, 2013 1:39 pm 
Offline

Joined: Fri May 25, 2007 6:43 pm
Posts: 2686
Would just query why you need similar gears to your road bike on a cross bike. You are likely to be travelling slower. Whether you are racing or not! Most of the single ring CX racers i know are using a wide ratio road cassette (11/28 ish) and something around the 40 tooth mark.

If you are just using it for gravel road hacking and the odd bit of tarmac, something like a 44/46 and 11/28 will give you a wide enough set of gears for 99% of what you are likely to do. And will use a standard road mech, with less big steps between ratios (my main bugbear with mtb cassettes in any application!)

You could even use an 11/29 campag cassette if you were that way inclined.


Top
   
PostPosted: Thu Jun 27, 2013 1:45 pm 
Offline
User avatar

Joined: Fri Apr 12, 2013 1:19 pm
Posts: 767
Location: South West England
mattr wrote:
Would just query why you need similar gears to your road bike on a cross bike. You are likely to be travelling slower. Whether you are racing or not! Most of the single ring CX racers i know are using a wide ratio road cassette (11/28 ish) and something around the 40 tooth mark.

If you are just using it for gravel road hacking and the odd bit of tarmac, something like a 44/46 and 11/28 will give you a wide enough set of gears for 99% of what you are likely to do. And will use a standard road mech, with less big steps between ratios (my main bugbear with mtb cassettes in any application!)

You could even use an 11/29 campag cassette if you were that way inclined.


It was basically for the top speed. The bike will be used as a general mess around/commuter bike on road/gravel with a bit of recreational cyclocross mixed in during the off-season. The reason I was looking at existing ratios was to keep my high gear for descending, as I tend to spin out with my 53/12 as it is so didn't want to go any lower really. However there may eb some merit in what you say, off-road at least, regarding top speed.

_________________
Campagnolo; because I ride a bicycle, not a fishing rod.
MASON Definition / Camapgnolo endurance & bikepacking build - ~8.4kg


Top
   
PostPosted: Thu Jun 27, 2013 2:46 pm 
Offline

Joined: Fri May 25, 2007 6:43 pm
Posts: 2686
alexh wrote:
It was basically for the top speed.
Tuck in and coast ;)

High 30s is doable on a 46/12 without too much pain (done it on my CX bike) and my muck about roadie runs a 49/13 (i think, might be a 14), which i've not (yet) run out of legs on.......

Have a rummage through this and see where you end up.
http://www.gear-calculator.com/#

But if you are keen for a single ring, i'd focus more on what you do most of the time, rather than what you do once or twice a ride. (and maybe having a lower top gear will improve your leg speed....... :wink: )


Top
   
PostPosted: Thu Jun 27, 2013 3:03 pm 
Offline
User avatar

Joined: Fri Apr 12, 2013 1:19 pm
Posts: 767
Location: South West England
It's all about low cadence and powerrr for me ;) but yes you are right. That looks like a brilliant tool - not seen that one before. Will check it out, thanks!

_________________
Campagnolo; because I ride a bicycle, not a fishing rod.
MASON Definition / Camapgnolo endurance & bikepacking build - ~8.4kg


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 7 posts ] 

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Single ring front - chainguide?

in Cyclocross / Gravel / Touring

Martin.F

11

777

Tue Nov 03, 2015 1:13 am

roadieboy View the latest post

There are no new unread posts for this topic. DI2 setup small ring rubbing front derailleur cage

in Road

muntos

5

375

Thu Mar 17, 2016 4:33 pm

Zigmeister View the latest post

There are no new unread posts for this topic. Single speed with Narrow Wide Oval Single Chainring

in MTB

eladlevi

5

667

Sat Sep 19, 2015 8:30 pm

MikeMoore View the latest post

There are no new unread posts for this topic. Campy Gearing Question

[ Go to page: 1 2 ]

in Road

joelpace

23

1251

Tue Jan 19, 2016 8:24 pm

Miller View the latest post

There are no new unread posts for this topic. Compact gearing doesn't feel smooth? Really?

in Road

RedRacer

14

1399

Sat Oct 31, 2015 12:41 am

deek View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: No registered users and 1 guest


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:  
Powered by phpBB® Forum Software © phpBB Limited