We have an old tandem with mafac type cantilevers. They don't have any toe-in adjustment on them and it is impossible to get one of the front pads anywhere near parallel to the rim let alone toed-in properly. Maybe the boss is slightly skewed although it looks ok.
As I have a spare pair of V-brakes (and lever) I tried fitting them. The problem is that the pin holes on the bosses where the spring is inserted seem to be in the wrong position for the v-brakes. Once the spring has been inserted into the hole the brake has to rotated through 270 degrees to get it vertical which is impossible. (Looking from the front the hole is at 9 o'clock position on the left hand fork and 3 o'clock on the right. The v-brakes have the spring pin at 6 o'clock position).
Has anyone come across this problem? Any suggestions?
Looking from the front the hole is at 9 o'clock position on the left hand fork and 3 o'clock on the right. The v-brakes have the spring pin at 6 o'clock position).
That sounds wrong! The holes should be on the wheel side of the mounting (inside the fork) rather than outside, which is what it sounds like you're saying. If the holes really are on the outside, then the bosses have been fitted incorrectly. V's and cantis should be interchangeable - I changed to Vs from cantis not so long ago and it was just a bolt-on job.
Looking from the front the hole is at 9 o'clock position on the left hand fork and 3 o'clock on the right. The v-brakes have the spring pin at 6 o'clock position).
That sounds wrong! The holes should be on the wheel side of the mounting (inside the fork) rather than outside, which is what it sounds like you're saying. If the holes really are on the outside, then the bosses have been fitted incorrectly. V's and cantis should be interchangeable - I changed to Vs from cantis not so long ago and it was just a bolt-on job.
As I have a spare pair of V-brakes (and lever) I tried fitting them. The problem is that the pin holes on the bosses where the spring is inserted seem to be in the wrong position for the v-brakes. Once the spring has been inserted into the hole the brake has to rotated through 270 degrees to get it vertical which is impossible.
In article <[email hidden]>, chrisg [email hidden] says...
Quoted message said:
We have an old tandem with mafac type cantilevers. They don't have any toe-in adjustment on them and it is impossible to get one of the front pads anywhere near parallel to the rim let alone toed-in properly. Maybe the boss is slightly skewed although it looks ok.
To toe in Mafacs, place a large screwdriver or similar bar between the two plates and tweak. Brutal, but it usually works.
Quoted message said:
As I have a spare pair of V-brakes (and lever) I tried fitting them. The problem is that the pin holes on the bosses where the spring is inserted seem to be in the wrong position for the v-brakes. Once the spring has been inserted into the hole the brake has to rotated through 270 degrees to get it vertical which is impossible. (Looking from the front the hole is at 9 o'clock position on the left hand fork and 3 o'clock on the right. The v-brakes have the spring pin at 6 o'clock position).
Has anyone come across this problem? Any suggestions?
Sounds strange to me - as if the bosses are on the wrong sides. You might be able to remove the adjusting plates from the brakes and drill new spring anchor holes in a more appropriate position.
As I have a spare pair of V-brakes (and lever) I tried fitting them. The problem is that the pin holes on the bosses where the spring is inserted seem to be in the wrong position for the v-brakes. Once the spring has been inserted into the hole the brake has to rotated through 270 degrees to get it vertical which is impossible.
Can you swap the springs around on the V-brakes?
The spring prongs are at 12 o'clock (inside) and 6 o'clock (outside) so swapping or rotating isn't possible.
In article <[email hidden]>, chrisg [email hidden] says...
Quoted message said:
We have an old tandem with mafac type cantilevers. They don't have any toe-in adjustment on them and it is impossible to get one of the front pads anywhere near parallel to the rim let alone toed-in properly. Maybe the boss is slightly skewed although it looks ok.
To toe in Mafacs, place a large screwdriver or similar bar between the two plates and tweak. Brutal, but it usually works.
Quoted message said:
As I have a spare pair of V-brakes (and lever) I tried fitting them. The problem is that the pin holes on the bosses where the spring is inserted seem to be in the wrong position for the v-brakes. Once the spring has been inserted into the hole the brake has to rotated through 270 degrees to get it vertical which is impossible. (Looking from the front the hole is at 9 o'clock position on the left hand fork and 3 o'clock on the right. The v-brakes have the spring pin at 6 o'clock position).
Quoted message said:
Has anyone come across this problem? Any suggestions?
Sounds strange to me - as if the bosses are on the wrong sides. You might be able to remove the adjusting plates from the brakes and drill new spring anchor holes in a more appropriate position.
Good idea - if I can find a small enough drill bit I'll give it a go.
