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Recreational Cyclocross and Gravelbiking This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like :The Dirty Kanza". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

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Old 01-02-06, 10:26 PM   #1
610
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Why do some CX bikes run a single ring in front?

inquiring mind want to know!
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Old 01-03-06, 05:19 AM   #2
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Many cx courses don't require the use of a large chainring, using a sinlge ring (with guards) saves a little weight and is one less part of the drivetrain to get fouled up with mud. Most riders use a mid size ring like a 42 this way they can get both some speed and climb.
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Old 01-03-06, 06:31 AM   #3
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Simplicity = improved reliability.... hopefully
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Old 01-03-06, 08:30 AM   #4
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Also, since you have only one ring, you can shorten your chain. This reduces the likelihood of dropping your chain, assuming you're using some form of a chainguard / chainkeeper up front. I've been running a 38t x 12-28 combination for years, in conjunction with a DA short-cage rear derailleur, and I have never dropped a chain.
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Old 01-03-06, 12:15 PM   #5
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I ran a 42 tooth chainring with a 12-27 cassette in the back. This gave me all the gears I needed for the courses I raced on. In addition, I didn't drop a chain in any race because I used a chain guard on each side of the chain. I am changing bikes for next year though, and may run a double up front, I am undecided. Ron
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Old 01-03-06, 12:27 PM   #6
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Single 42 with a ten speed 11-28. Saves weight, gives me all the gears I need.
If anything should demand lighter gears than 42-28, I would probably be shouldering the bike anyway.
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Old 01-03-06, 03:46 PM   #7
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Lectorn has right, in my winter bike cyclocros EMPELLA i've 42 and 11-28, those gears are best for me too training and competiton.

Simply and lightnes quick shift and no problems.
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Old 01-04-06, 11:30 PM   #8
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Simpler, lighter, cheaper, sturdier - how often do you get all that at once.

Why carry more parts around than you need. Most cross courses don't have long enough paved sections to do a lot with the big ring and if you need a granny gear you'd go faster running so why have the extra stuff on your bike.

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