
The Karate Monkey got Disc'd this weekend. The Avid BB7 mechanical disc brakes came in from the retailer for $84 with free shipping including 160mm rotors.
Changes in my toolbox and my values
I grew up a little recently and decided to spend some $ on tools and less on accumulating more bikes and useless parts. I bought new brake tools including a Park Tool cable cutter and cable puller. No longer will I use the electrician's snips and needle nose pliers to cut housing and cable!!!
I also decided that off-brand cables and housing for brakes and shifters are a thing of the past. I bought XTR shifter and brake cable kits.
Initial installation consisted of ripping off the old Deore linear pull calipers from the cantilever bosses and quickly mounting the rotors to the wheels (with adaptors for LX splined hubs) and the calipers to the fork and rear triangle. I sized and cut the cables and housing to fit the frame and followed the Avid installation guide to the letter. I even read a few blogs and the Park Tools Blue-Book for backup knowledge.
Results and lessons learned:
1. MOUNT AND ALIGN THE CALIPER. With all tension removed from the alignment screws (backed off until slack), tighten the brake pads tight against the rotor. Now tighten the alignment while the whole caliper sits in line with the rotor. Now back off the red knob a few clicks until there is no rubbing/scraping.
2. TRIM CABLES AND HOUSING LIKE A PRO. Use a cable cutter, dremel tool, file, whatever. Remove all burs and shoot for a perfect "dead end" that does not crimp or bind. Use the cable puller to remove all slack from cable so that all lever movement moves the brake pad to the rotor.
3. CLEAN THE ROTORS AND KEEP THEM CLEAN. I used isopropyl alcohol because I couldn't find any denatured alcohol. It REALLY made a difference in my performance because I dirty-fingered the rotors initially and couldn't stop without squeezing the lever to the grip.
My first ride with them installed and set up correctly was flawless. The brakes grabbed without locking up, and required very little lever movement.
The equipment gets a 5 star rating for performance, aesthetics, ease of installation and price. Highly recommended.