's Forum Archives - Cyclo-Cross

Archive Home >> Cyclo-Cross(1 2 3 )

New grouppo dilemma(4 posts)

New grouppo dilemmalonefrontranger
Jul 3, 2001 8:40 PM
My new Colnago road bike has finally arrived and criterium season is over (hooray!) This means my battered old Redline Conquest finally gets a much-deserved vacation to have the nonfunctional Frankenstein grouppo replaced.

Dilemma: what to replace it with? I race 'cross competitively on this bike and also use it as a commuter. Shedding some weight (from the bike, please!) would be nice, since it currently weighs over 26 lbs - mostly in parts like a horrible wheelset, 10-year old seatpost / stem, etc. I'd like to put Campy stuff on it, since my road bike will have C-10 and features like wheel compatibility are always nice.

However, after lurking around this forum, I've seen C-10 contraindicated for 'cross due to crud factors and ring size issues. I'd like to spec a 36/50 - 13/26, is this wishful thinking on my part?. If I can do this more easily using Shimano, I'll just bite the bullet, since I'm not a Campy fundamentalist, just prefer the ergonomics.

The 'cross racing I did in Ohio was basically flattish grass criteriums with little to no mud/slop and could be (and was often) done on an unmodified road bike. If I was still living there, I'd just put stock Chorus 10 on the thing and be done with it. However, I'm now living in Boulder, CO and have no clue what the conditions here will be like.

As always, all information, opinions, rants, raves, flames or advice is welcome.
Front Range cyclo-crossBipedZed
Jul 3, 2001 11:32 PM
The majority of cross courses in the Front Range are on hardpack dry dirt/scrub vegetation. Some of it single track (bad), most of it at least wide enough to pass. Rarely do conditions get muddy, except when it snows which it did a lot last November. Some races were held in 20 deg F with new snow, and some a few days after a snow storm when the snow was melting and it would be a mud fest. But most races are pretty dry with maybe some mud patches. Almost all courses from last year had at a few decent run-ups per lap. Mountain View Race Track (auto/motorcycle) had quite a few races last year that went into the infield and then back on the track (weekly training races plus a few weekends) but I'm not sure what is going on this year with that facility. CU held their own cross series which was more like a BMX course, too much singletrack, but still fun. 2000 Boulder SuperCup was held on the CU course. But my favorite courses were the Air Force CX (held on the Academy athletic fields), which was a grassy open fast course (very Euro), with a heinous 3-story stair run up, and the CX State Championship at the Jefferson County Fairgrounds, great course, nice barriers and other natural obstacles, and a section with the finish line that went indoors in the expo area in front of stands.

I don't know much about Campy but if you want a 36 you probably won't find much in a 135mm BCD. While 10spd could certainly get clogged, there isn't too much in the way of mud in CO, and if there is, you're running a lot anyway.

FWIW, I run a 48/36 Race Face crank with a Shimano 12-25 cassette. I'm toying with going to a single ring this season.

Hope this helps some.
re: New grouppo dilemmaCliff Oates
Jul 4, 2001 4:07 PM
You could always go Campy 9 speed and swap cassettes when you swap wheels -- the spline pattern is the same. A 13-28 cassette is available in 9 speed (13-14-15-17-19-21-23-25-28) which will get you a good low gear. This cassette will work with regular cage derailleur like Daytona and will get you roughly the same ratio as a 36-26.

FWIW, neither Shimano nor Campy doubles will take a 36t chainring. Shimano's 130mm bolt circle goes to 38 teeth while Campy's 135mm BCD limits it to 39 teeth. You might want to keep your eyes open for a used Sugino 110mm BCD double. They don't make them any more, but they used to be fairly common. 110 bcd cranks will accept a 34t ring.
Some other alternatives for you to considermanicmtbr
Jul 5, 2001 6:49 PM
I also remember Ritchey road cranks having a 110 MM bolt pattern. I personally bought a used Mavic crank (110 bp)with 36/46 chain rings. In the rear, I run a 13-26 cassette and the gearing seems good.

FWIW, I think running a Campy 10 speed groupo on a cross bike is not a good idea. I am basing that on the conditions in the Mid Atlantic (muddy), but basic economics tell me that you should find a deal on a used Campy 8 speed set-up. I saw a Mirage group for sale on today's listing for 175.00 shipped (and no, it is not mine). The Mirage group is a low-down group, but it works fine, would be worlds better than what you may already have and the price is nice. I cannot remember if it had wheels, but I have had no problem getting 8 speed campy stuff for my bikes.

BTW, how the heck did you manage to be competitive on a 26 lb cross bike? Especially racing that sucker on the road? Oh well, I guess you will be that much stronger on your new road bike. Good Luck, LFR.