XT brake lever segments

[dyna-ti]

You know, those little plastic bits that sit inside the brake at the back of the lever.
I think they were to do with running cantis, something about more pull :? I think that's what they were for so can someone confirm, and that they weren't to do with more power or anything like that.

I had a pair of STi but it was a bit shabby. Then I spot one on ebay which is in great condition but missing those segments. also I found 2 of the tiny screws that hold the cable cover on were really chewed
I swopped over the very fiddly segments and managed to extract the chewed screws,replacing those with one and one from both covers on the older sti. It means my better condition sti has all the screws but the tatty one only has one screw per side. It allows the covers to stay secure

Im giving a mate the old tatty sti as hes an occassionaal rider but im upgrading the drivetrain for him.
He has V's fitted.
Will I need something to bond into where the segments were or for V's is that just not the option.

 

[foz]

I think they were so you could adjust the cable pull and modulation at the point the pads hit the rim? With the xt M739 levers, the cable is held to the lever blade via a "pulley" that moves in a slot (where those little black half moons go).

I'm pretty sure the system was designed so that for a given amount of lever pull, at the start of the pull the pads moved a long way to contact the rim quickly, then as they got to the rim they moved less far for the same lever pull, which increased modulation. Depending on how many half moons were there, (2, 1, or 0), the effect was more or less noticeable.

I'd need to check the instructions, but seem to remember that taking the half-moons out meant better braking - so everyone took them out and it's rare to find levers that still have them in.

 

[mrdryskull]

when they are in,,more cable pull = firmer feel at lever,less braking power.
when they are out,,less cable pull = mushy feel at the lever,more braking power.

 

[dyna-ti]

when they are in,,more cable pull = firmer feel at lever,less braking power.
when they are out,,less cable pull = mushy feel at the lever,more braking power.

:shock: :shock: EEK !!

Too short and concise an answer for RetroBike .






Cheers

 

[OllieJones]

None in = Canti, both in =V

 

[FluffyChicken]

Re:

Leave out and ride it properly.
The two bits (or one depending on which xt from 739 to 770) is in for beginners who need poor brakes.
Shimano set it like that for 'safety'
Anyone in their right mind should remove it and use the brakes proper.

Here's the 770 version. It the 739 is the same, bar having and intermediate setting.
https://static.bike-components.de/cache ... 7cb42a.pdf

 

[FluffyChicken]

when they are in,,more cable pull = firmer feel at lever,less braking power.
when they are out,,less cable pull = mushy feel at the lever,more braking power.

True, but doesn't give the real story.

With them out..
They have the fast, high cable pull at the start, when they hit the rim it forces the holder to move inwards (often heard as a click on old levers) and move to the low cable pull proper power setting.
Given once they hit the rim in either position the pads cannot go further into the brakes, any extra cable pull you may have had on the poor setting is useless.



Mushy is what poor setup brake sfell, they should just feel smoother. Though I guess some call mushy the fact you don't need to put effort in the be able to modulate and stop the brakes easily.

 

[dyna-ti]

when they are in,,more cable pull = firmer feel at lever,less braking power.
when they are out,,less cable pull = mushy feel at the lever,more braking power.

True, but doesn't give the real story.

With them out..
They have the fast, high cable pull at the start, when they hit the rim it forces the holder to move inwards (often heard as a click on old levers) and move to the low cable pull proper power setting.
Given once they hit the rim in either position the pads cannot go further into the brakes, any extra cable pull you may have had on the poor setting is useless.



Mushy is what poor setup brake sfell, they should just feel smoother. Though I guess some call mushy the fact you don't need to put effort in the be able to modulate and stop the brakes easily.

So would this be a racing setting then :? you keep one finger on it 1/2 pulled to feather the power :?

 

[FluffyChicken]

Re:

Wouldn't call that a racing setting but a riding the bike setting. It just gives you more power and more control of the braking for the same effort in your fingers.

 

[dyna-ti]

Re: Re:

Wouldn't call that a racing setting but a riding the bike setting. It just gives you more power and more control of the braking for the same effort in your fingers.

Ill stick to the romantic notion of an old school racing set up cheers

And its for a mate who probably wouldnt notice. He'll be just chuffed to be losing the bottom of the range plastic gripshifters.