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Discussion Starter · #1 ·
issue of the day: my crazy unreliable rear Avid Mech on my X-5.

I am running full housing and Avid SD Ultimate levers, with all bits tuned for the amount of modulation I like... about halfway between Hayes DH (on/off feel) and Hope Mini (modulating to death).

on a very rocky high alpine ride last Tuesday, I noticed that the rear suspension action causes the rear mech disc brake to behave erratically. basically the lever feel would change with the suspension action, feeling like some third person was pulling against the cable at some point between the lever and the brake caliper.

the cabling doesn't bind anywhere, and is free to flex. no pinch points.

has anyone else experienced this cable tension issue? I'd like to solve it without buying some hydros for the X-5, but then again... I'm tempted by the Louise FR and the Mono M4 and one of my frames needs some disc brakes which could quickly and easily swap over from the X-5.

I welcome all comments, suggestions, or just plain screeds against my idiocy.
 

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I would be interested to know whether there is an issue as well since I am contemplating between an Avid Mechs and a Hydro....

fishy
 

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You have full length housing and no binding. That eliminates basically all the cable related possibilities right there. Here is my experience anyway...

On Barny's XCE we ran into a few issues with the mech. First, at full compression the housing would loop up and snag on the seatpost binder collar. This would tug the housing out of the upper seatstay housing stop and the brake would lock briefly until it popped back into place. Solved that by shortening the housing and reorienting the collar to face back. The same issue could arise if suspension compression pushes the housing forward through the top tube housing guides, and then has to pull it back when the suspension rebounds. This would be especially true of open guides like Ventana uses where you don't snug the hose in the guide with a zip tie or something. Sounds like you have already ruled this issue out though.

Also, the Avid mechs don't take a housing end cap (ferrule) where the cable housing enters the brake. The naked housing is supposed to slide right down into the brake's stop. This is hard to see because it's down inside that rubber boot. If you use a housing end cap, the housing just sits perched at the entrance to the stop and can bind if the housing moves (not usually a prob with horst-link bikes where the brake sits on the seat stay, but could be an issue with non-horst 4-bars).

Love my mechs, but love my Juicys more.
 

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Discussion Starter · #4 ·
good info, Tscheezy, thanks! I may have put a ferrule on the caliper end - I'll check that right now. I'll check other cable housing travel path issues a little more closely too.
 

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tscheezy said:
Also, the Avid mechs don't take a housing end cap (ferrule) where the cable housing enters the brake. The naked housing is supposed to slide right down into the brake's stop. This is hard to see because it's down inside that rubber boot. If you use a housing end cap, the housing just sits perched at the entrance to the stop and can bind if the housing moves (not usually a prob with horst-link bikes where the brake sits on the seat stay, but could be an issue with non-horst 4-bars).
Hey Tscheezy, the brake will take an endcap, just not the standard one but one with a more narrowed nose. I use the Jagwire POP (points of power - or something goofy like that) ferrules and they seat fine inside the brake stop. However, I have some slightly wider non-POP Jagwire ferrules and they are too wide to fit.
To make this even more confusing, I'm building up a Burner for a friend who has a new Avid mech 160 rear (waiting on the 185 front). I don't know if this would be considered an '04 or an '05 brake but the stop now takes the slightly wider non-POP ferrule. Strange. I assume it's model year brake related as my 3+ year old Mechs reguire the narrower POP ferrule to seat inside the stop. The boot covers the entire ferrule.

Of course now that you've mentioned it above - even though a ferrule will fit, is it necessary any more? The more I think about it, the more I don't think it's even needed due to the protection from the boot and the depth of the stop on the brake.
 

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Discussion Starter · #6 ·
Tscheezy, you called it!

I'd used a ferrule that is too large in diameter, and the cable wasn't seating properly in the caliper. I didn't notice it because it was behind the little rubber boot.

sux to be idiot me.

thanks, Tscheezy!

hey, how's the Nixon?
 

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Yay. Sometimes I screw up in reverse and get it right.

I won't know how the Nixon is until 1) it gets shipped to me and 2) until I fly home to where the packaged is destined and mount it up. Early September at this point.
 

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Discussion Starter · #8 ·
some flighty thought made me think it was already on-board. but now I remember that Pete's photos of your ride showed the Marzocchi on the bike.

let us know how it works out, I'm thinking about a 6" fork for the X-5.
 

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welcome to check it out firsthand gonz

gonzostrike said:
Tscheezy, you called it!

I'd used a ferrule that is too large in diameter, and the cable wasn't seating properly in the caliper. I didn't notice it because it was behind the little rubber boot.

sux to be idiot me.

thanks, Tscheezy!

hey, how's the Nixon?
since it may be a while until Tscheezy gets home and has his Nixon installed w/ full ride report i am sure ...feel free to stop on into the shop anytime Gonzo ...i just had a call from Manitou that my shipment of forks left and should be here by friday. And if you come down on saturday you could join a few of us on a ride.

later, Chad
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http://redbarnbicycles.com/
 

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Discussion Starter · #10 ·
nwmtb said:
since it may be a while until Tscheezy gets home and has his Nixon installed w/ full ride report i am sure ...feel free to stop on into the shop anytime Gonzo ...i just had a call from Manitou that my shipment of forks left and should be here by friday. And if you come down on saturday you could join a few of us on a ride.

later, Chad
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http://redbarnbicycles.com/
Hey Chad, how's your summer going?

I'm going to take my big Banshee to ride lift-served at Snowbowl today, and am riding the X-5 on the long Sheep Mountain loop tomorrow.

What are you up to on Tuesday and/or Wednesday? One of my riding buddies and I usually do a trail ride in the Bitterroots on either of those days (they are his Sat & Sun essentially). We've been having fun on the Camas and Blodgett trails this summer.

I'd like to stop by to see your shop and the Nixons. And, of course, to do some riding in the Bitterroots.

Sean
 

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Completely off of the subject of AVID/X-5 issues ... it sounds like your woes are taken care of anyway.

Is snowbowl making a valiant attempt at establishing trails, and obstacles ? I might have to make it up there sometime to check it out ... Sheep mountain on the otherhand .. i've endured that heinous 4 hour climb before, OUCH !

Today's ride was rough ... Reimel Creek (pic #1) is rocky, and the trails don't see much useage. So the riding is slow, and technical. We took Reimel on up to the Continental Divide trail (pic#2) and rode the ridge for a dozen miles or so. Eventually we took off down the Nem-eh-pooh trail that spurs off of Gibbons Pass road and enjoyed a very steep, rocky, and at this time rain drenched decent ( no pic )

anyway ... give me a call when you think you might be down, and i can arrange to hook up with you guys for a ride...Camas is always a treat.

later, Chad
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http://redbarnbicycles.com/
 

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Discussion Starter · #12 ·
Snowbowl was fun, but I wouldn't risk the trip -- unless you have a craving for the Last Run Inn's food, drinks or pretty bartenders (go Sara!). Only two trails, one is just a jeep road that's not really any fun at all. The other is a singletrack that's sorta fun, but someone messed up the switchbacks. Every corner exit is climbing, as if it were built for motos and not MTBs. In other words, it needs work. No obstacles/stunts/etc., but the Lolo Ranger District is soliciting suggestions on where to build such things (other than the ones that they let us build on Deadman's Ridge Trail at Blue Mountain).

Sheep Mtn yesterday was gruesome for me, I'd ridden hard on Friday and Saturday and I ended up walking about 60% of the climb -- dead legs wouldn't respond to pedaling. The descent was excellent as usual, though. Today's my day off riding, but from the looks of the weather outside, I don't mind skipping the day. ;)

If the weather eases up tomorrow or Wed I'll call you to see about a shop visit & ride.

Sean

PS- is that a 5-Spot in Picture #1?
 

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Nah ... i wouldn't post a pic of a guy on a Turner in the Ventana Forum ;)

Rick is on a 32lb Salty... and he better be as he likes to break things the way 210 lb aggresive riders tend to do. Anyway, sheep mt... i think is gruesome for all. Did you guys get a little wet ? Rain ... rain ...rain go away. Well, on second thought..better than fires i suppose.

Well....i'll talk to you tues/wed, i've got a couple of rides picked out to run by you.

later, Chad
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http://redbarnbicycles.com/
 
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