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Disc brakes(11 posts)

Disc brakeshelton
Jan 8, 2003 10:37 AM
Are any of you guys using disc brakes? I have never road a bike with them..I have thought about building up a cross bike and using them..Anybody have any experience with them? If so what brand do you use? Thanks for any info....
re: Disc brakesatpjunkie
Jan 8, 2003 2:16 PM
I think Avid is the only company that makes road discs. If you are planning on a race bike, the weight may be prohibitive, if for a fun adventure bike would be fine.
Not for CX, but.........TWD
Jan 8, 2003 5:15 PM
Haven't used discs on a cross bike, but have the Avid mechanicals on my MTB. They work awesome, especially in the wet.

Whether or not they're needed for cross is a whole different can o' worms, especially for racing.

IMHO, depending on your riding style, riding conditions, weight, and intended use discs can be anywhere from the best thing since sliced bread to complete overkill.

I originally got the discs to combat the sloppy winter riding conditions I face daily here in Oregon. Discs work awesome in the wet on long steep descents. I've never used a rim brake (V, canti, or magura hydraulic) that works even close to as well in the wet and grit. In addition, you won't wear out the sidewalls on your rims. Not a problem in a dry climate, but a common occurrence here.

Since I'm convinced that my cross bike should be able to go anywhere and do everything (riding on all the mtb trails, CX racing, commuting, winter road rides, pulling a trailer etc..) I would love to have discs on my cx bike.

Avids road disc brakes are the only commonly available cross-compatible disc that I'm aware of. If they are any thing like their MTB counterpart, they'd be a good choice if you think you need discs.
Heading in that directionpeter in NVA
Jan 11, 2003 1:52 PM
I'm looking into a new cross bike for mostly woods riding and will be going with the Avids. According to their web site, each brake is only about 150gm heavier than the Shorties, so I don't understand this concern about weight.
The only down size I'm finding is wheel availability. Looks like Mavic just came out with a 700cc disc wheel but since the standard seems to be 135mm hubs, I'll need a custom frame.

Just ground away my new pads and most of my new rear rim in the snowy, muddy conditions here in Virginia.
weight...atpjunkie
Jan 13, 2003 12:27 PM
150 grams per brake. That comes out to 5.35 ounces or over a quarter pound per wheel. That winds up 10.7 ounces (half pound +2 oz.) heavier than cantis. In our race this weekend we had 4 portage sections including 1 steep uphill with 2 barriers, plus 3 other multi barrier sections. So per lap you were lifting and sprinting (one time per lap up-hill) 4 total times and the race was 7 laps. That is 28 lifts (including 7 uphill sprints). 28 x 10.7 oz equals and extra 18.725 lbs you've had to lift and carry per race. At the level of exertion in a cx race that is near 19 lbs of waste and wasted energy to carry it you could have used to drop the S.O.B. sitting on your wheel. For a trail bike it makes sense, for racing, cx hurts enough as it is, why add more misery.
Right About the Weightpeter in NVA
Jan 15, 2003 12:49 PM
I'll be using it mostly as a trail bike. My bike seems heavy enough now when I carry it!. I didn't know what mud was like when I lived in LA, I can pick up 2-3 pounds of Virigina mud in a single ride and then you feel your lifting a brick. I remember the few times I rode in Adobe mud out in CA and swore never to do it again, but out here there's no choice. I found your math entertaining, but its still only 1/2 pound per carry...look at it as weight training! (Any good riding around Palomar Mountain?...used to frequent that area years ago before I discovered bikes)
Right About the Weightatpjunkie
Jan 15, 2003 1:10 PM
I'll tell ya that half pound starts adding up. first lap feels like nothing. second lap bike feels a little heavier. by lap 6 you are convinced someone has filled the frame tubes with lead. I know it's only a half but in a race that weight matters (and I'm no gram counter). I try to avoid weight training DURING RACES, otherwise I'm all for it :o). Yes Sandy Eggo is king when it comes to Adobe. Most coastal canyons are impossible to ride when wet. Wheels freeze up every 30 or so feet. Yes, good riding up Palomar, mostly on Roadies (fine bit of Suffering). Good Winter Hill Training, too hot in summer. Fun in January as you may get passed by Eric Zabel, Floyd Landis, Hincapie etc...as many train there (and Tucson's Mt Lemmon) in the winter. Great riding in Laguna Mountains in East County (4-6K elevation and believe it or not SNOW) going out there soon.
California Snow Ridingpeter in NVA
Jan 16, 2003 4:20 AM
Let me know if you get to go snow riding and what its like.
I once went down Mt Wilson - had no winter cloths (like I do now) and really froze. Plus it was much more dangerous than out here - people don't realize what exposure there is off the steep SoCal mountains. Here if I go off the trail, I'm still in the woods - there where you live...maybe several hundred feet lower!
California Snow Ridingatpjunkie
Jan 16, 2003 1:26 PM
will do. some people out east don't realize how high mountains get out west. Most have a hard time fathoming that 45 minutes from the beach you are at 5000 feet elevation in Pine and Fir groves. We're having a hot spell (may hit 80 today) so I'm going to have to wait a bit. yes, hills do have some serious drops and at lower elevation trails are lined with cactus. I'll post pix when I do.
May hit 8 tonight...peter in NVA
Jan 16, 2003 2:13 PM
Hope to make it out of my driveway tomorrow for a ride!
May hit 8 tonight...atpjunkie
Jan 16, 2003 3:31 PM
that looks like fun! I wanna ride in snow!!!! oh well I guess I'll go console myself by laying on the beach. I'm a t work right now in a tee, shorts and flip flops.