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How big a cluster can I run?(7 posts)

How big a cluster can I run?Graydon
Oct 11, 2002 8:04 AM
I'm looking at a Fuji Roubaix Pro, with a 105 front and rear der. The front rings are 39/53, and the back cluster is currently 12/23. How big a cluster can I run in the back witout having to switch rear ds? How small a chainring can I run in front without have to change the crankset or front d? I need to know since I ride a lot of longer distance/big climb stuff (Eagle County, Colorado). I'd just get a triple, but this bike is such a sweet deal, I don't want to pass it up.
27 in the rear, 38 in the frontstr8dum1
Oct 11, 2002 8:20 AM
27 in the rear, 38 in the front
Maybe even 30 in rear..Chen2
Oct 11, 2002 8:24 AM
I put a 14-28 Cassette on my wife's 9-speed Ultegra and I've heard of people going as high as 30t, but Shimano says 27 is maximum.
~Al
Noisy and rough thoughteoteoteo
Oct 11, 2002 11:51 AM
27t is max...the last thing you want to do is rig stuff. You CAN put bigger than 27 BUT it will run poorly, being noisy and very rough. Not what you want when you live in the mountains and aren't just on a short visit.
Noisy and rough though?Chen2
Oct 11, 2002 1:42 PM
That would not surprise me, but in the case of my wife's bike, the 28t cog runs smooth and quiet.
~Al
another option4bykn
Oct 11, 2002 10:25 AM
I think you can use a mountain bike derailleur and go bigger, like maybe XT der. and 34 cog. You'll need a longer chain, though.
re: How big a cluster can I run?moabbiker
Oct 13, 2002 4:05 AM
If a 39/27 isn't enough for you, and you aren't committed for a triple, then you'll want to look for mtb gearing and derailleur setup. The Shimano mtb cassettes and derailleurs will mount just fine on a road bike..