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MTB to Cyclocross conversion, brake reach?(6 posts)

MTB to Cyclocross conversion, brake reach?dregan
Jun 30, 2002 7:43 AM
I'm wondering if anyone knows of a good way to fit 700cc wheels on an MTB frame for 26" wheels? I know paul components makes a v-brake that allows the brake pads to slide higher up the legs to reach the bigger wheels but they are $107.00 each! Someone has to make a cheap little gizmo, no?
centerpulls?bk19
Jul 1, 2002 6:25 AM
I have heard of some folks using centerpull brakes. They provide the clearance you need for most CX tires and will allow you to use 700c wheels. Just mount the brake through the fender mount hole on the brake bridge.

That being said, I thought about doing this when I converted an old mtb to a CX bike, but decided to just stick with 26" wheels. The decision was mostly financial (already had spare mtb wheels, some narrow slicks for road/touring and found some cheap 1.7 knobbies for trail/CX use). This story is pretty similar to my own as far as set up and experience goes:

http://www.cyclingnews.com/tech/2002/features/frankenbike.shtml
mtb conversionpunkassjay
Jul 1, 2002 12:32 PM
Hey, cool project bike! I tried the same thing several years ago, and ended up with this beastie. The tires are Continental Cross Country's, 1.5", which is pretty darn narrow for an mtb tire, and I could run it at 70 psi.

Do you like the ride? I never was able to get the geometry right for me...I eventually sold it to help finance the purchase of a true cross bike.
I keep posting these...Jan Gerrit Klok
Jul 2, 2002 12:51 PM
They just work so great for me, I now have a CX front in my communter/trianing mtb permanently. I like that ride much better that way.

http://www.bike2build.nl/toonartikel.php?productgroepid=001&hoofdgroepid=002&subhoofdgroepid=019&subgroepid=150&artikelid=01668

Good luck and keep us posted with your progress!
I keep posting these...dregan
Jul 2, 2002 8:37 PM
Thanks Jan, Those are the "gizmos" I've been looking for. Sounds like you like them so they must work. Are they heavy?
I keep posting these...Jan Gerrit Klok
Jul 2, 2002 10:15 PM
Well, they work well unless in the worst of mud, if cramps the mudclearance at the brake by a nice margin. Held me up considerably in that first mayor race with them, visiting the pitlane to clear my bike from mud to be able to go on.

Someone should stand up and make them with a 3cm higher arch, and in the process make them 29" compatible. Any handyman should be able to upgrade them by welding/attaching a new arch to them. The mounting part of the things are what makes them more complicated to build from scratch.
They weigh 120g a piece, which I think is nog bad at all.

Should you be putting the 700c wheels in a suspension fork, do up front make sure bottoming out doesn't bring the slightly taller 700c*34 tire doesn't hit the crown, else ENDO will come upon you!

Installation is dead easy, and cables can be kept as they are. Brake performance is really good, gives an odd sensation, with the skinny tires on a taller rim, you can calculate that you indeed get more brakepower from it. The narrow tire makes that you more easily come to the traction limit, even at the front wheel.