Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the January Giveaway for the DYU R1 20" City Electric Bike


Cross Gearing - How Many Combos Are Bad?
#1
I know it's a no-no to ride with the gears in opposite extremes - big front ring and biggest rear cog or small front ring and smallest rear cog. And I know those gearings would could chain rub on most bikes ...

But should I expect there to be two or three gears at each extreme where I hear rubbing? On the little front ring, the two or three smallest rear cogs have chain rub, and vice versa on the big ring.

It's a brand new SRAM Force 10sp set up. Shifting works well both up and down, so I'm not sure what to adjust. I'm hoping it's not related to frame geometry and the chain line. (Which doesn't seem all that extreme, but what do I know ...)

Thanks,

Andrew
  Reply
#2
Depends what it's rubbing on. The problem with cross chaining isn't so much rubbing but that it puts excess stress on the chain and derailleurs. Going into them isn't going to brake anything, but the more time you spend there the more wear.

If the chain is rubbing on the front der, you may either need to adjust the front cable, or you may just need to learn to "trim" the front der. I'm not sure if SRAM force has a trim adjustment or not.

If the chain is rubbing on the middle chainring when it is on the small one in front, not much you can do about that.
  Reply
#3
I have a 2008 Trek Madone with Dura Ace (10-sprocket cassette). I recently moved to Alabama and took my bike to a local shop because the chain has been skipping teeth, so it's time to replace the chain, cassette, or both. I explained that the problem occurred most on the fourth sprocket (from the inside) and the small chainwheel. The tech asked if I ever used the fourth sprocket/large chainwheel, cautioning me that this was very bad for the chain. I hadn't heard someone say that for about 20 years. My understanding was that new technology made that a thing of the past. After all, the fourth sprocket is in the middle of the cassette. How could that be a problem?

Who's right here? Could fourth sprocket/large chainwheel be a bad combination?
  Reply
#4
I'm not aware of any "new technology" that has made cross chaining any better. But hard to believe that going from big to 4th is a big no no. As you say, this is almost the center of the cassette. Sad to say, but the high end stuff like this is made for short term performance, not durability. Seems to me that riding a bike with 10sp Dura Ace is "very bad for the chain" period.
  Reply
#5
Yeah, that just doesn't make any sense. The tech was telling me to always use the small chainwheel except for the high gears, which I guess he means the two or three smallest sprockets. Maybe he believes that the small ring is centered to the sprocket and the big ring is offset.

Sheldon Brown has a good post on the benefits of today's bushing-less chains, mainly having to do with lube flow. The Dura Ace setup doesn't seem to wear any faster than the Ultegra on my previous bike, but it shifts much more crisply and the brakes are noticeably better.

Thanks for the feedback!
  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post
 
6,210
05-05-2014, 07:09 PM
Last Post: nfmisso
 
5,953
03-01-2014, 10:53 AM
Last Post: jid
 
5,860
08-11-2013, 08:22 PM
Last Post: 1FJEF
 
20,191
02-20-2012, 10:46 PM
Last Post: ghost
 
7,122
11-07-2011, 07:55 PM
Last Post: Sparkie

Forum Jump:

[-]
10 Latest Posts
Brand New Rusty Steel Split frame Bike
Today 12:55 AM
Breaking in Brooks B17 Imperial
Yesterday 03:42 PM
Big Basso, Tiny Colnago
Yesterday 03:26 PM
ebikes and regular bikes
Yesterday 03:15 PM
Customer service
Yesterday 02:48 PM
First Century
Yesterday 02:08 PM
Ethical Dilemma
01-14-2022 09:00 PM
Failure to stop at stop sign means $500 ...
01-14-2022 01:54 AM
How much do you bike per year?
01-12-2022 09:42 PM
Counsel on a ‘73 Raleigh
01-12-2022 02:55 AM

[-]
Join BikeRide on Strava
Feel free to join if you are on Strava: www.strava.com/clubs/bikeridecom

[-]
Top 5 Posters This Month
no avatar 1. Jesper
24 posts
no avatar 2. ReapThaWhirlwind
17 posts
no avatar 3. Jake1
14 posts
no avatar 4. jeffg
11 posts
no avatar 5. JR Namida
10 posts