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53 to 48 Chainring, do I need to change my Front D position(8 posts)

53 to 48 Chainring, do I need to change my Front D positiontxcross
Jun 10, 2003 5:23 AM
My cross bike came with a 53-39 combo up front. I am hoping to do some racing in the fall and am going to switch out my 53t for a 48t. Do I need to move my front D lower on the seat tube or will it's current position work? Current position is ~1mm above large ring when engaded in large ring.
Park Tool Site - Good ResourceSean008
Jun 10, 2003 11:23 AM
This site has all the info you should need:
Park Tool Site - Good Resourceatpjunkie
Jun 10, 2003 11:32 AM
also most f derailleurs come with instructions on mounting height. Depending on your course you may only want a 46 or 44. I rarely (or never) used my 48x12 or 48x11 in races. I may go to a 44, am going to experiment.
Why stop there?triangleforge
Jun 10, 2003 12:52 PM
If you're going to a 39/44, why not just single it up? I'm single ring 42, with an 11-27, and it covers pretty much every situation I've been able to imagine so far!

Single Ring, have debated it.atpjunkie
Jun 10, 2003 3:20 PM
am a Clydesdale and like the smaller ring. actually mine is 48/36 and I'm thinking 44/36, will make a tighter chain as well.
Sorry, bad assumption!triangleforge
Jun 11, 2003 7:27 AM
A 36/44 would be pretty handy, and a more snug chain would be a nice side benefit.

I got tired of dealing with derailed chains at the front (and with the various band-aids out there to try to prevent them) and went single with T/A guards on either side, and have been quite happy. That said, a 36 might save the day now and again!

Sorry, bad assumption!atpjunkie
Jun 11, 2003 9:56 AM
if I was built like a cyclist instead of a 2 seat in a heavyweight boat I'd definitely go single. Even at my sveltist I won't go under 205 lbs. I'm not a fat man, just a big one. (close to 6'5" and not the skinny rail type). yes I tire of the deraillment as well, cost me a possible win (got 2nd) and a 2nd or 3rd ( I took 4th) in 2 races this season.
Yes,10mm.Samu Ilonen
Jun 11, 2003 1:13 AM
I have just ordered my own design ti-cross frame+fork and it's drawn so that it takes normal brace on der. and uses rings 48 to 53. Adjusting range is needet 10mm.