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Another remedial question: crossed up(11 posts)

Another remedial question: crossed uplitespeedchick
Oct 13, 2003 1:24 PM
Say I'm in the big ring in front. How big can I go in the back before I am officially crossed up?
re: Another remedial question: crossed upss jimbo
Oct 13, 2003 2:20 PM
I don't ever use the top two cogs in the back with the big ring. I will though use the second smallest in back with the small ring. I have no good reason for my incosistency in this matter, so completely ignore my advice.

Another good reason to ignore my advice might be that I have a 7 speed cluster in the rear.

jimbo
re: Another remedial question: crossed upmorkm
Oct 13, 2003 3:28 PM
I think Sheldon Brown talks about this on his website, but I agree with Jimbo and don't use the top 2 cogs in the rear when in the big ring. Unlike Jimbo, though, I stay consistant and don't use the bottom two cogs when in the small ring. I find that trying to go any smaller in the back while on the small ring creates too much rub on either the front derailer or on the big chainring itself.

Something else worth trying is running the numbers on your setup through a gear calculator and finding out which combinations are pretty much overlapping, to give you a better idea of when it's unnecessary stress on your chain to be somewhat crossed up in one gear combination (like big ring, top of cogs) when you could get almost the same ratio in a much less stressful (to the chain) combo.

And for the record, I'm using 9 cogs in the rear.
re: Another remedial question: crossed upss jimbo
Oct 14, 2003 10:16 AM
since my cassette is not as wide I don't have as big a problem with cross chaining. As for looking at the gear calculator, I generally would rather cross-chain for a while rather than going back and forth between the big ring and the small ring.

I guess cross chaining wasn't a big issue with 5 speed freewheels.

jimbo
re: Another remedial question: crossed upmapei boy
Oct 13, 2003 4:27 PM
If you have Campy, it's just fine (if not especially politically correct) to ride in the second largest rear cog when you're in the big ring. By the same token, it's fine to be in the second smallest rear cog when you are in the small ring. It'll also work okay to be in the biggest rear cog with the big ring and the smallest rear cog with the small ring, but I wouldn't make a habit of it. When you're in these combos you can hear and feel the chain squeezing up against the front rings, and rattling through the front derailleur cage. With Shimano, I dunno.
Thanks everyonelitespeedchick
Oct 14, 2003 4:26 AM
I liked the answers. My husband was chewing on me last week for being crossed up while in the big ring and the 4th biggest cog. (yes, Campy)

I'll be politely ignoring him on this subject now.
Depends on your individual set upKerry Irons
Oct 13, 2003 4:31 PM
On my bike, I can use any gear except small-small, as the chain rubs the big ring in that combo. Any other combination, including the 53/23 (big/big) works fine with no complaint. Is the chain at an angle? Yes. Is it "officially crossed up"? Not in my book. It's all a matter of degree, as any combo except the middle couple of cogs will have some chain angle. Farther away from the middle cogs means more chain angle, but there's no magic line you cross (pun intended).
How about efficiency wise...torquecal
Oct 13, 2003 5:50 PM
Not so sure what the official definition of crossed up is, but take a look at the gear inch calculators out there (I use Sheldon Brown's). Input your gearing info and then examine the chart - look for where the gear inches from one chainring overlap those from the next. That will tell you where your most efficient - assuming the drivetrain and chainline are all set up correctly to begin with.
re: Another remedial question: crossed upmtpisgah1
Oct 14, 2003 3:04 AM
If you are concerned about the efficency,then check the gear calculators. If you are concerned about binding, then put the bike on the stand and gently shift into the big ring and largest cog. If it starts to bind then you can stop it easily. The way my bike is set up is so I can be in the big ring and big cog with no problem (just a little rub on the front der.).
Except in a race, it doesn't matter. Make sure it can though.nmSpunout
Oct 14, 2003 3:54 AM
re: Another remedial question: crossed upAsiago
Oct 14, 2003 7:05 AM
Well, for me, in the big ring, I'll use the second biggest cog if I know I'm not going to have to pedal hard in it, because if I do pedal hard in the 21, the chain will skip. An example is I'm cruising along in a group or something and we hit a slight incline and I need to drop it down one gear to keep my cadence where I want it. If I know I'm not going to be in the gear for long, which means I won't have to pedal it hard, I'll put it into the 21 for a short time. If we are going hard and I need that gear, I'll switch to the small chainring and appropriate rear cog (16).

Asiago