smd4

Juvenile Rheumatoid Arthritis?

dedhed

just riding along

smd4

I know. Also known as a "dick move."

choddo

Yeah, that’s a good idea but take care, slipping off can cause some nice shin scrapes if you suddenly discover you need to hurry up. You’ve made me think about how I clip in now and I think I gently toe the pedal, at noon, forward to get it horizontal and then slide the shoe along it to find the socket and then gently push once I’m sure it’s in the right place so I’m putting some power to the chain as it snaps in. Never had the shoe slip backwards doing that although I have, as above, had it go off the side if careless or even misalign and get my shoe up against the crank and had to start again a few strokes later. Usually this is all by feel although I might glance to check the pedal is “spring downward” when I start.

and I do all of this in a big gear because it buys me more time to clip in.

What sort of pedals are you using?

Polaris OBark

Looks like the material snapped.

If caused by an accident (crash), I agree.

If JRA, as I specified, then it is worth a try.

Shimano has warrantied stuff for me under less compelling conditions (which I informed them of).

Polaris OBark

"Just Riding Along", meaning you didn't do anything out of the ordinary.

I still think it is worth a try. The worst they can say is no. If it works out well, you have a new back-up/replacement.

Koyote

Your confusion now makes sense.

smd4

You'd probably pull a JRA.

howaboutme

I'm using Look. I'm just getting back into cycling after a few decades off so I'm not nearly as competent as I should be.

howaboutme

Too late. I've already bought and replaced it.

choddo

Worth a try if you still have the broken one. i’ve still got a spare Ultegra shifter from years ago because I did exactly that.

I use Look as well. They do tend to behave themselves as long as you don’t shoot off too fast and spin the pedal. The thing I didn’t say was I do all of that out of the saddle. Maybe everyone does but thought it worth mentioning explicitly.

Polaris OBark

Unless you tossed the old one into the trash, it isn't too late. Send it to Shimano. They will inspect it and replace it if they decide it is a warranty issue (I have no idea, but I have big feet, am right-footed, and have had Di2 for almost 10 years without issue, so there might be a new design flaw in the 12-speed 105.)

At the very least, keep the old one for spare parts. Your bike shop should have pursued the warranty for you.

Polaris OBark

I had someone in my research group who suffered from this. I wouldn't wish it on anyone.

howaboutme

I still have it so....

Incidentally, I am at the office today and my colleague brought his bike in w/ the older 105 rear derailleur and it's all metal!!! The part that broke, which on mine is plastic, was all metal before.

FBinNY 

Anyone who's worked in a bike shop has heard it countless times.

It's the opening phrase of a warranty request.

I was just riding along........

.

Polaris OBark

Send it to their office in Irvine. Be prepared to wait a month while hearing nothing. If it is approved, a new one will arrive unannounced at your door-step.

jgwilliams

That was unfortunate. I've had an opposite issue where my foot slipped forward when I was trying to clip, hit the QR lever and undid it. Fortunately, I noticed immediately. Yet another plus for thru axles, I guess.

SoSmellyAir

This series of questions is kind of off-topic but very interesting. Yes, to both questions. I am also right-handed in everything except hockey, which I play with a left-handed stick.

Not sure, because I do not have any power meter. My left leg may be marginally stronger, but maybe because I always launch my bike with a left leg stroke. I often put more weight on my left foot when I am standing still for a while. But if I was doing a long jump with a running start, I would jump off my right foot and land on my left foot.

Yes. I have never tried the opposite direction; I may not be even able to do so.

No, but why would riding a motorcycle matter?

This is the weird and interesting part: I always clip in my left foot first, launch my bike with a left pedal stroke, lower my bum onto the saddle, and then clip in my right foot, usually when the pedal is at or just past top dead center.

When coming to a stop I feel more comfortable unclipping my right foot when the pedal is at or just past bottom dead center and putting my right foot on the ground, because I feel more balanced at slow freewheeling speed when my left foot is clipped in and the left pedal is at bottom dead center, which matches my standing posture.

Kontact 

Exactly my point.

Kontact 

Your QR lever wasn't nearly tight enough or at a proper angle if this happened.

Garthr

I think derailleur ought to be able to endure a foot flying off the pedal. Plastic has no business being used where it is in that derailleur. I'd still send it for warranty. If denied, so what. If they send you a new one, sell it or donate it, but myself I'd never trust such a design. Shimano's turned "soft" .... ahahahaha... literally.

jgwilliams

Frankly, that's tosh. There's no point having QR if it's so tight it can't be undone by hand, and the angle was pretty much dictated by the design of the fork.

Koyote

If the RD broke and the derailleur hanger is intact, then it is a faulty design, IMO.

howaboutme

I submitted a ticket or whatever it's called last night. There's no room for pictures, just description so we'll see. the RD was on a new bike so that's a bit more complicated. We'll see.

smd4

Not really. The QR doesn't have to be so tight that you can't open it by hand, and you can position the lever in unlimited angles--even straight down if that's what floats your boat.