's Forum Archives - Cyclo-Cross

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

MTB Frame for CX bike?(9 posts)

MTB Frame for CX bike?Pygme
Jan 26, 2003 7:04 AM
Sorry if this has been asked before.

I have enough MTB parts laying around my garage to almost build a new bike except for the frame.

I was wondering, could I make a CX bike out of a MTB frame. Of course, I would go with a rigid fork, drop handlebars, and 2X drivetrain.

I am not looking to be CX World Champion. Basically, I would use the bike for rides on the MUT and an occassionaly local CX race.

Anyone try this?

BTW, the frame I am looking at is the Nashabr MTB frame.
some answersbuffalosorrow
Jan 26, 2003 8:12 AM
Typically MTB frames have a longer top tube than road bikes and cross frames, this makes the reach with drop bars a difficult situation to fit. Can be done with a short stem, or if you have short legs and long torso. WTB dirt drops can work aswell. I would and have done in the past is just run the MTB bars, many cross riders race with MTB bars, toss the bar ends as they are not UCI legal, if you plan to race. If not, as my girlfriends rigid SS keep em'. More hand positions.

I like the idea of an old school MTB resurrection, Chris Chance of Fat City/ Chance cycles, a few on ebay, that are breath taking. Tom Ritchey MTB splatter painted frames, the list goes on... Go rigid.
re: MTB Frame for CX bike?Fixie-ated
Jan 27, 2003 5:12 AM
I had actually just asked this same question in a post only a few ahead of you, "What to do?"

There does not seem to be a whole lot of feedback on this topic, so I am going on ahead with my plan.

My project will use my retired Lightspeed Hiwassee frame. If you are interested in the outcome, I will send you some pictures and the ride results.
re: MTB Frame for CX bike?Fixie-ated
Jan 27, 2003 5:21 AM
Here is a picture of the mtb before I stripped it of parts last Saturday.

I will be hunting the LBS's for a nice rigid fork. Then, I will use Ultegra 9 STI with an XT rear der. As far as a crank and chain rings, I am going to try using an Ultegra with 53/42.

I am also shopping for some 26" 1-1.5" tires with semi-smooth rolling surface or anything similar to my current Michelins tread pattern.
MTB Frame for CX bike?buffalosorrow
Jan 27, 2003 8:20 AM
what size is the headtube?
I have a blue breezer 1" rigid fork, as a spare that I can part with.

The only way I can see a MTB geometry working as a cross bike, is to go with a 90 degree rise stem and most likely more. Depending on the fit of the frame. If you perfer to have a steep reach, as I do 10cm, this can work for you. But you may find that if you perfer level seat and bar heights, it may be a stretch.
This just throws off the ideal balance, depending on the rider. As long as the comfort issue works, I see no problems. But as I have seen in the past, build up a MTB cross hybrid and with in a fews months you have spent you savings on a new cross rig.

The best advice I can give, I dont spend too much time and money. Aside from new tires and a possible rigid fork. Keep the riser bars, stem and components. And in a a years or so try to save for a used or entry level cyclocross.

otherwise all the parts are a snap, most work with each other.

Tires try anything cheap and narrow, or on sale. Although the Conti cross country 1.5's are the beter cross tire, but thy will cost you.

best of luck.
re: MTB Frame for CX bike?dlbcx
Jan 28, 2003 9:09 AM
Sorry about the slow reply. Anyway, just use your existing wheels...I was just describing how someone had modified their mtn bike for 700C wheels.
As for STI, if you keep your existing V brakes then you will have to use Travel Agents since the cable pull of the road levers won't be enough to get the brakes to work. So, you could change the brakes to canti's then you won't need the Travel Agents. However, you want the power of the V brakes but don't want to deal with the adaptors then Peter White Cycles sells something called 'Strange Brakes.'
For cranks, I would change the big ring to something smaller, maybe 46 or 48. Not too many races around where you get away with a 53.
Check Cyclocrossworld for tires. I think they sell Michelin Jets, which have a semi smooth surface.
26" 'cross tireLars46
Jan 28, 2003 9:53 AM
try this:

then: "racing"

then: "CX Pro"

Size(inch) 26 x 1.35

Weight(gram) 405

Larry in Canada.
re: MTB Frame for CX bike?bigolbstrd
Jan 29, 2003 11:41 AM
Done a little digging check:
700c CX wheels in 26"MTB, done thatJan Gerrit Klok
Jan 29, 2003 1:29 PM
Brake adapters or cantilevers with long reach will allow you to do so (for those that need brakes).

Use a shortened straight bar to a legal 50cm as I did once, even on the Dutch elite nationals, or get a ca. 4-5cm shorter stem and dropbars with whatever controls you want.

"Ultech" brake-adapters as so often advertised by myself here do the trick to fit 700c wheels in a 26" mtb when using rim brakes, mud clearance is bad however, the adapters may need some work to become really good overall. On intermediate trails, the bike was great, despite the higher BB due to the bigger wheels.

Good luck!