Early XTR M900 brakes - straddle length for front and rear?
- Thread starter vshuvalov
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vshuvalov":13b3dqtr said:
Can anyone shed any light on the early cantis being different lenght F/R?
I've just taken a canti off the front and rear and compared them on the bench, and I can't see any difference. What am I missing? Every dimension I look at seems to be the same, there's no different markings or anything...
For the record, these are 1993 or older cantis.
Trying to get my Caygill build correct.
Cheers,
Neil.
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Re:
M900 are A/73 front and rear, but nothing to stop you using your own lengths if your frame is odd and give the correct setup.
Pads should be clamped near the end.
That's how they came out of the box.
The rears have a different profile so you wouldn't kick them with your heals etc.
They look shorter and have a smaller cutout
The similar sized ones allegedly was with the cartridge style pads 1995/6 BR-M900-c.
I never bought or had any cartridge bits so not too sure. Could just be regurgitated hearsay.
But it is A/73 you should setup with, be it the original pro-set or the later fixed straddles.
Only if it is not working would you try another size.
Follow the instructions to setup.
But on its own,
Fit with no springs in.
Clamp up canti pad near the end of the stud for narrow rims, closer for wider rims.
Wind brake lever adjuster halfway out.
Fit cables and clamp so brakes are against rims.
Wind brake adjuster in
Remove, fit springs and refit
Annoyingly it may need tweaking with the springs in.
what levers are you using?
They should feel soft, but have loads of power if M900 levers (or other SLR Plus), like you are crusing the rims with ease.
When you get used to them, the cam should start to move in at the same point they hit the rim. That's when it moves into the power curve.
M900 are A/73 front and rear, but nothing to stop you using your own lengths if your frame is odd and give the correct setup.
Pads should be clamped near the end.
That's how they came out of the box.
The rears have a different profile so you wouldn't kick them with your heals etc.
They look shorter and have a smaller cutout
The similar sized ones allegedly was with the cartridge style pads 1995/6 BR-M900-c.
I never bought or had any cartridge bits so not too sure. Could just be regurgitated hearsay.
But it is A/73 you should setup with, be it the original pro-set or the later fixed straddles.
Only if it is not working would you try another size.
Follow the instructions to setup.
But on its own,
Fit with no springs in.
Clamp up canti pad near the end of the stud for narrow rims, closer for wider rims.
Wind brake lever adjuster halfway out.
Fit cables and clamp so brakes are against rims.
Wind brake adjuster in
Remove, fit springs and refit
Annoyingly it may need tweaking with the springs in.
what levers are you using?
They should feel soft, but have loads of power if M900 levers (or other SLR Plus), like you are crusing the rims with ease.
When you get used to them, the cam should start to move in at the same point they hit the rim. That's when it moves into the power curve.
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They're both rear canti'sNeilios":iy32vhdd said:vshuvalov":iy32vhdd said:
Can anyone shed any light on the early cantis being different lenght F/R?
I've just taken a canti off the front and rear and compared them on the bench, and I can't see any difference. What am I missing? Every dimension I look at seems to be the same, there's no different markings or anything...
For the record, these are 1993 or older cantis.
Trying to get my Caygill build correct.
Cheers,
Neil.
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Re:
*Always* a thing, ever since first appeared for 1992 (ok actually appeared in 1991) as I had a set and still have them. They had different style straddle cables but that was it (in my opinion the better style of straddle cable ;-))
They have if I remember correctly F and R stamped on them too, there is a slight variation where the SLR cover stop is smaller (or larger, i forget which way) that may not have F and R on them
Date stamps should be in the straddle cable hook side recess.
*Always* a thing, ever since first appeared for 1992 (ok actually appeared in 1991) as I had a set and still have them. They had different style straddle cables but that was it (in my opinion the better style of straddle cable ;-))
They have if I remember correctly F and R stamped on them too, there is a slight variation where the SLR cover stop is smaller (or larger, i forget which way) that may not have F and R on them
Date stamps should be in the straddle cable hook side recess.
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Re:
I've just realised I never did put the detailed catalogues up.
In the 1992 one (launch year of M900).
It actually references them as
BR-M900-F/R and it's not just the pads in the other side.
I've just realised I never did put the detailed catalogues up.
In the 1992 one (launch year of M900).
It actually references them as
BR-M900-F/R and it's not just the pads in the other side.
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Re:
I guess one confusion came from XT and DX at the time using B/82 at the rear an 2.0mm at that (m900 went to standard 1.6mm, every weight saving helps ;-))
B/82 gives you a worse angle (more acute) at the straddle compared to A, which isn't good for the design of M900.
I guess one confusion came from XT and DX at the time using B/82 at the rear an 2.0mm at that (m900 went to standard 1.6mm, every weight saving helps ;-))
B/82 gives you a worse angle (more acute) at the straddle compared to A, which isn't good for the design of M900.
