building a 1x9 cx...need some suggestions on parts..
09-08-08, 11:18 AM
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building a 1x9 cx...need some suggestions on parts..
After watching some cx youtube vids I got excited for the fall season and want to try it out. I decided to look through my parts bin and see if i have enough parts to build a cx. I'm thinking 1x9. What chainring should i go with if i have a 12-25t cassette? I know this might not be a favorable cassette, but like i said, parts bin. Also, what is a better option for a rear derailleur, a mountain or road one?
thanks!
thanks!
09-08-08, 11:51 AM
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I'm running a 12-27 with a 42 in the front. My current RD is a XT that I had in the drawer. Everything works for my tests so far. First race is in a couple week so I'll know more after that.
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09-08-08, 01:11 PM
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You don't need a mountain der if the cassette is 12-25. For the chainring, 39t (parts bin!) should work well. A front der can work fine as a chainkeeper. Just mount it as low as possible, and set the limit screws so it doesn't rub the chain.
09-08-08, 02:03 PM
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couple more questions...
if i use a triple crank...can i use a short cage 105 derailleur(1st generation)? Maybe ill have too many redundant gears. So if i stick with the original plan of having 12-25 in the back, and my middle chainring is a 39T it looks like i might be golden. Do I need to consider bb length? 109 vs 113(or is it 118?)?
if i use a triple crank...can i use a short cage 105 derailleur(1st generation)? Maybe ill have too many redundant gears. So if i stick with the original plan of having 12-25 in the back, and my middle chainring is a 39T it looks like i might be golden. Do I need to consider bb length? 109 vs 113(or is it 118?)?
09-09-08, 09:47 PM
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I'm running a single 42 with an outer ring guide and a 12x27 in back using a standard Dura Ace RD-7700. Perfect tension and shifts and no drops after several hundred trail miles. Pretty bulletproof setup.
09-10-08, 06:55 AM
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couple more questions...
if i use a triple crank...can i use a short cage 105 derailleur(1st generation)? Maybe ill have too many redundant gears. So if i stick with the original plan of having 12-25 in the back, and my middle chainring is a 39T it looks like i might be golden. Do I need to consider bb length? 109 vs 113(or is it 118?)?
if i use a triple crank...can i use a short cage 105 derailleur(1st generation)? Maybe ill have too many redundant gears. So if i stick with the original plan of having 12-25 in the back, and my middle chainring is a 39T it looks like i might be golden. Do I need to consider bb length? 109 vs 113(or is it 118?)?
Be sure to put a value in under Gain Ratio, the data will provide road speed @ your crank RPM.
This is great for selecting a cassette & chain ring combinations. Put in your current data, too; its a reality check.
Michael
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When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.
09-10-08, 08:07 AM
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couple more questions...
if i use a triple crank...can i use a short cage 105 derailleur(1st generation)? Maybe ill have too many redundant gears. So if i stick with the original plan of having 12-25 in the back, and my middle chainring is a 39T it looks like i might be golden. Do I need to consider bb length? 109 vs 113(or is it 118?)
if i use a triple crank...can i use a short cage 105 derailleur(1st generation)? Maybe ill have too many redundant gears. So if i stick with the original plan of having 12-25 in the back, and my middle chainring is a 39T it looks like i might be golden. Do I need to consider bb length? 109 vs 113(or is it 118?)
