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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 08-11-12, 12:42 PM   #1
TommyBing
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1x10 or 1x11 Campy Conversion

Hey all, first post here. Not much of an internetter.

I ride an Ibis Hakkalugi that no longer sees racing duty. It's now almost exclusively a daily speed-commuter for my 50km (round trip) commute. I also take it out on road rides with the locals for a fast 100km +/- ride a couple times a month with 25mm Gators. It only sees the trail a few times a year now. (Sadly)

My problem: I have a crank that just took a brutal hit and is now trashed. I was very lucky that the frame even survived. I also lost the front derailleur.

My question: I would like to use one of my Campy road cranks and convert my gearing to a 1x10 or 1x11 (one is a Campy Centaur 10-speed 53/39, the other is an Athena 11-speed 53/39). I have a 10-speed cassette that's 13-29 and an 11-speed that's 11-25. I envision taking off the 53t ring and putting on a chain guide. (But I don't know which brand/model since I've never run a single gear up front in my life.)

I also have a junk single speed (bent frame) with a SRAM S300 1.1 GXP 48t crank on it that I could potentially salvage. But I have never tried running that with my Campy gear in the rear. I bought this crank off a kid who was using it naked (no chain guide/watch/anything) on a 1x10 with SRAM/Shimano gear.

So that's my situation. I would like to run 1x10 or 1x11 using my existing stuff with minimal further purchases apart from stuff to keep the chain on up front.

My preference would be to run the 48t SRAM crank with the huge range 13-29 10-speed Centaur cassette. If I stay with the 39t Campy road cranks, I imagine I would have to use the 11-25 11-speed cassette, but I'm not sure. 39 x 13 or 39 x 14 (with the better chain line) sounds a bit weak to me.

I know this is a CX forum and this is a pretty unique question since this is no longer a CX bike. But is has a CX soul, and I figure there are a bunch of folks out here running single gear cranks. So I hope to get some feedback.

Any suggestions or criticisms are most welcome. I'd like to keep this project under $200. I never use my 53t ring, but if I had a 48t I would use it every second.

Cheers!
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Old 08-11-12, 01:02 PM   #2
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I've been running a bike with an 8 speed rear and single 50T chainring in front, but I live in flatland, Michigan. Personally if it's use was a commuter type bike, I'd probably go with one of the 39T chainrings, unless you live in the flats too. Get a good chainkeeper b/c it's annoying as heck when they toss off. I think Paul's is a good one. I went without for quite awhile, but ended up buying some $13 thing off amazon, then rebending it so it surrounded the chainring rather than just buffered the inside as a dogtooth would.

As far as fast rides, I spent the previous two summers with a knee problem.. To help keep myself from overdoing it I ran a 48T with a 14/28 7speed freewheel. Worked well and I could solo up to 30mph and in a paceline got up to 34 once. So if you can spin well enough, the 48 won't limit you terribly bad.
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Old 08-11-12, 01:15 PM   #3
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I'm running a Chorus crankset with a single ring. I bought a NOS 42t center ring off an 8spd Campagnolo triple. I think I spent $25 on the ring and about $15 on shorter chainring bolts.

K edge makes a nice nice chain guide for singe ring bikes.

Last edited by thirdgenbird; 08-11-12 at 01:36 PM.
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Old 08-11-12, 03:00 PM   #4
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Quote:
Originally Posted by jbrow1 View Post
I've been running a bike with an 8 speed rear and single 50T chainring in front, but I live in flatland, Michigan. Personally if it's use was a commuter type bike, I'd probably go with one of the 39T chainrings, unless you live in the flats too. Get a good chainkeeper b/c it's annoying as heck when they toss off. I think Paul's is a good one. I went without for quite awhile, but ended up buying some $13 thing off amazon, then rebending it so it surrounded the chainring rather than just buffered the inside as a dogtooth would.

As far as fast rides, I spent the previous two summers with a knee problem.. To help keep myself from overdoing it I ran a 48T with a 14/28 7speed freewheel. Worked well and I could solo up to 30mph and in a paceline got up to 34 once. So if you can spin well enough, the 48 won't limit you terribly bad.
All but 3km of my 50km commute is flat, and it would feel great to spin 48 x 13 all the way to work. And 48 x 29 would get me up the big hill on the way home. But will the SRAM S300 crank play nicely with my Campy gear? I just put the Record chain on the SRAM crank and it seems okay but it's off the bike and this is certainly no decent means to test it.

Over the long term is there any issue running the Campy chain with the SRAM crank?
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Old 08-11-12, 06:57 PM   #5
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I did a quick google search and everything it came up with said as long as you use the proper chain (9sp, 10sp, etc.) for what you're running it should be fine.
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Old 08-11-12, 08:36 PM   #6
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Originally Posted by jbrow1 View Post
I did a quick google search and everything it came up with said as long as you use the proper chain (9sp, 10sp, etc.) for what you're running it should be fine.
I didn't really know much about this SRAM S300 1.1 GXP crank, but it's billed as a 10-speed on their site. I just bought it because it looked cool and the guy only wanted $40 for it. I suppose I can only use this with a 10-speed Record chain and 10-speed Centaur cassette. That works for me. But I just didn't know if over time the SRAM imparts undue stress on the Campy chain?

Pedal hard in Michigan, dude.
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Old 08-15-12, 09:40 AM   #7
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I run an ultegra chain on my campy drivetrain w/o problems. The chain and drivetrain is 10 speed.
I would imagine you wont have a problem at all with a campy chain or a sram chain. It just needs to match your drivetrain cassette width.

You can get a bashguard and a third eye watcher all for under $25 bucks.
Third eye is like $8
bashguard online is like $15 look up bbg bashguard.
Not sure if you need short stack bolts.
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Old 08-15-12, 10:57 AM   #8
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Quote:
Originally Posted by TommyBing View Post
All but 3km of my 50km commute is flat, and it would feel great to spin 48 x 13 all the way to work. And 48 x 29 would get me up the big hill on the way home. But will the SRAM S300 crank play nicely with my Campy gear? I just put the Record chain on the SRAM crank and it seems okay but it's off the bike and this is certainly no decent means to test it.

Over the long term is there any issue running the Campy chain with the SRAM crank?
As long as you are not trying to use a 1/8th inch track chainring there will be no issue. The 3/32 chainring that comes with the s300 should work fine.
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Old 08-15-12, 03:39 PM   #9
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Cyclocrossworld.com has the 135bcd chainguard , in a 44 T diameter ,
for the outside

might ad a chain-minder [etc] on the inside .. maybe a single speed tooth chainring
since the shift ramps make jumping, easier for the chain.. not always desirable.. for the rider..


A 10 and more so 11 speed drive train will lighten you wallet,
buying chains and cassettes over a few times


maybe the light wallet will get you faster to the front?

Last edited by fietsbob; 08-15-12 at 03:47 PM.
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