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My LBS Wrench is stumped...any suggestions. ?????(15 posts)

My LBS Wrench is stumped...any suggestions. ?????Scot_Gore
Mar 19, 2003 12:53 PM
I checked my bike into the LBS yesterday after trying to find the problem myself. Just popped over at lunch, and my wrench is still stumped.

Background,
Went for first outdoor ride since 1/10/03 on Saturday. 45 mile hill route with tons of sand, rivlets of melting snow, and a little crunch and munch across ice pack remnants on 700X23s. No problems on this ride. Brought the bike home, wash down and re-lube about 3 hours after the ride. Took the ride out of a 20 miler Monday night. First brake from speed I hear a click, click, click. Definitely tied to the speed of the bike, only occurs while braking from more than @12mph. Wheel spins true while in stand. Being in or out of the saddle does not appear to effect the click.

Wrench has.
Re-tensioned rear wheel.
Re-Built rear brake.
Removed chain guard.
Checked for flaws and cracks on rim.

He's still looking and is confident he'll track down the click.

Tech Specs.
Wheel - Shimano R-535
Brake - Ultegra
Frame: A1 - Alum.

Any suggestions welcome

Thanks
Scot
re: My LBS Wrench is stumped...any suggestions. ?????JS Haiku Shop
Mar 19, 2003 12:58 PM
does it happen when pedaling?

does it happen when coasting?

can you duplicate it with *bike* in stand?

has wrench put another rear wheel from another bike in

frame and ridden it to isolate problem to existing rear wheel?

have you removed, greased, and reinstalled pedals?

have you swapped front wheel?

stupid question: do you have wheel reflectors on wheels?
re: My LBS Wrench is stumped...any suggestions. ?????Scot_Gore
Mar 19, 2003 1:17 PM
does it happen when pedaling?
Don't know, didn't try pedaling and braking at the same time.

does it happen when coasting?
Yes

can you duplicate it with *bike* in stand?
No, only when decelerating from speeds greater thatn 12mph with a rider on bike. Click occurs all the way to 0mph if it starts.

has wrench put another rear wheel from another bike in frame and ridden it to isolate problem to existing rear wheel?
I don't think so

have you removed, greased, and reinstalled pedals?
No, but click ONLY happens when the brake is applied and does not appear to be related to pedal action.

have you swapped front wheel?
No

stupid question: do you have wheel reflectors on wheels?
No
re: My LBS Wrench is stumped...any suggestions. ?????abicirider
Mar 19, 2003 1:04 PM
couple of other things to check, possibly computer sensor and magnet slightly touching each other, maybe your cleats on your shoes, or even if you have cable ties on your fork coming in contact with spokes, also check headset make sure it is tight as well as bars.
Good Luck
Be safe out on the roads!!!!!
Ray Still
Mooresville, NC
re: My LBS Wrench is stumped...any suggestions. ?????Beaver
Mar 19, 2003 1:06 PM
Did you check to see if there was any grit embedded in the brake bad? That's my guess.
Yes, first thing I looked for....thanks anyway. (nm)Scot_Gore
Mar 19, 2003 1:19 PM
re: My LBS Wrench is stumped...any suggestions. ?????pdg60
Mar 19, 2003 1:37 PM
Not very familiar w/those Shimano wheels.

Does the rim have a seam/pin or are they welded? It could be the brake pad over the seam...

This used to be common in Trek Matrix rims and was not always visible to the "naked" eye.
re: My LBS Wrench is stumped...any suggestions. ?????brider
Mar 19, 2003 1:42 PM
If there's a sleeve inside the rim at the joint, it may be moving as the rim flexes under load. Wouldn't show up on repair stand (but should even when pedaling, so maybe not the problem). Don't know that there's a fix for this other than running some epoxy inside the rim, or replacing.
Put White-Out at the rim joint and watch for it while riding...Quack
Mar 19, 2003 1:49 PM
Paint a big stripe of white out at the rim joint and ride it. If you hear the click at the same time the stripe passes the brake, bum rim... I think the poster above mentioning the rim joint plug is right on the money...The plug is loose or the weld has let go.

Good luck!
That's an easy oneAaronL
Mar 19, 2003 2:30 PM
Here is your problem.

Look at the inside of your brake pads and under the pads on the holder is a little plastic screw. That screw is hitting the spokes (since they are on the outside of the rim). I have no idea why Shimano put them there.

Anyway, your pads are worn down so the screws hit them. Shimano even says to remove them when you use their wheels. Take them out and all will be fine. They only clank at speeds abouv 12MPH because you are applying more pressure to the brake.

AL
duh, point out the obvious ;)sievers11
Mar 19, 2003 4:27 PM
How are you going to post that perfect anwser as I am typing complete bull.

Good hint, I just got a new set of the 7701s. I think Shimano has the worst instruction manuals in the history of instuctional manuals. The set up on the Flight Decks are horible.
Sorry :)AaronL
Mar 20, 2003 8:55 AM
I give you credit for original thinking.

AL
Yup! Bingo!2melow
Mar 19, 2003 5:43 PM
That little plastic "nub" on the bottom of the brake pad is hitting your sidepull spoke eyelet on the Shimano's.

You can either buy new pads, or file down the nubs on the pads and get a few hundred more miles out of them.
re: My LBS Wrench is stumped...any suggestions. ?????sievers11
Mar 19, 2003 4:22 PM
If it is realated to speed than it is definatly in the wheel/brake area.

If I am not mistaken the 540 have a small dot on the braking surface, why I don't know but...if you still have the Ultegra pads, toss them directy to hell. They eat rims for breakfast.

My best guess is that you roughed up the rim by riding in the sand and grit. That caused the demonic pad to start their evil bidding and embed chunks of AL in the brake pad. If it did this in just the right place that embeded chunk of AL could be ticking agaist that dot in the rim.

(Wow, I just went out on a limb.)
Thank You AaronL (and everyone else)Scot_Gore
Mar 20, 2003 11:14 AM
I phoned in everyones suggestions to my wrench yesterday. I put emphasis on AaronL's ideas since it seemed so definitive. Just got back from picking up my baby, it was indeed the little screws booping up against the spokes.

For those of you not familiar with these wheels. The spokes are reversed laced. The nipples are at the hubs and to hooks are on the outside of the rim.

My wrench took the screws out of the brake and wahlaaaa, no click, click, click. YEAH!!!!

RBR is a great community.

Thanks to all.

Scot