Unusual Clunk on Pedal Start

[Veloo]

WOW!
Glad you're (fairly) OK.
Can't believe you snapped the adapter.

[m_sasso]

What brand of tool was that, who made that 1/2" to 3/8" drive adapter?

[purpurite]

Originally Posted by m_sasso

What brand of tool was that, who made that 1/2" to 3/8" drive adapter?

Great question. I usually only buy Craftsman sockets, but I have a feeling I bought this to adapt my manual needle torque wrench for BBs, and I think it was MasterForce from Menards. No markings, I'm betting on Masterforce.

[purpurite]

Originally Posted by charliedid

Fun

I'd have put a pipe wrench on it if I knew the BB was toast.

I tried. I don't have a big enough pipe wrench, so I used what I had. I'm 150 pounds soaking wet, so I use mechanical leverage when at all possible. I may have used too much this time.

[tomato coupe]

Originally Posted by upon3

Bears v Packers coming up in 20, so I'm taking a break now.

Is this their 200th game?

[Veloo]

Is that a house brand?
Like our Canadian Tire Mastercraft? Or Home Depot Husky?

Originally Posted by upon3

Great question. I usually only buy Craftsman sockets, but I have a feeling I bought this to adapt my manual needle torque wrench for BBs, and I think it was MasterForce from Menards. No markings, I'm betting on Masterforce.

[purpurite]

Yup. Who knows who makes it? I normally don't buy cheap tools for this reason.

[purpurite]

Originally Posted by tomato coupe

Is this their 200th game?

Yup. I'm not optimistic with this one.

[NickJ]

This anecdote might be helpful. I picked up a brand new TCR this fall. Of course I expected some weird noises for the first 50-100 miles as it broke in. The rear hub was ridiculously quiet, very stealth. But I had a very odd clunk during power down - very similar to what you describe.

I’m out for a ride around mile 40 of ownership, we stop for coffee, then upon returning to the ride: all of a sudden I own the loudest bike in the history of bikes. You can hear me and my rear hub coming from half a mile away. Something clicked and the hub started to work. AND the clunk disappeared too.

Your issue could be as simple as: A. Give it some time. B. Pull the hub ratchet cover and see what’s what.

[purpurite]

Originally Posted by NickJ

The rear hub was ridiculously quiet, very stealth. But I had a very odd clunk during power down - very similar to what you describe.

Your issue could be as simple as: A. Give it some time. B. Pull the hub ratchet cover and see what’s what.

Yeah, the hub is strangely super quiet, but it's a fairly old bike build. I pulled the cassette and yanked the axle out, and it doesn't have cartridge bearings in the freehub, which I wasn't expecting. Ball bearings everywhere. In order to get the freehub body off, though, I need a 12mm allen key, which I don't have (who does?). So, progress is stalled for a couple of days.

I tend to now think it's a pawl not engaging in certain spots, if not at all. I'll find out more once I get the freehub body off, but I think I'm getting closer.

[charliedid]

Originally Posted by upon3

I tried. I don't have a big enough pipe wrench, so I used what I had. I'm 150 pounds soaking wet, so I use mechanical leverage when at all possible. I may have used too much this time.

Amen

[oldpotatoe]

Originally Posted by upon3

Yeah, the hub is strangely super quiet, but it's a fairly old bike build. I pulled the cassette and yanked the axle out, and it doesn't have cartridge bearings in the freehub, which I wasn't expecting. Ball bearings everywhere. In order to get the freehub body off, though, I need a 12mm allen key, which I don't have (who does?). So, progress is stalled for a couple of days.

I tend to now think it's a pawl not engaging in certain spots, if not at all. I'll find out more once I get the freehub body off, but I think I'm getting closer.

Menard's does..Comes off similarly to a shimano BIG allen in there, lefty-loosey. Been a while, not sure it's a 'unit' like shimano or has pawls on outside.
BUT if able to see..clean with tooth brush, oil 'em, don't use grease..

[purpurite]

op, or anyone else, have you ever seen GXP bottom bracket cups that were different ODs? One was very much 44mm and the other was definitely 45mm and was not something I have encountered before. I looked for specific 45mm cup tools last night and I couldn't find any. Product defect or operator error?

It could be why it was so painful to remove—it may have been "installed" with a lot of red Loctite instead of proper torque. Looking back at the photo of the two cups, the threads are pretty different looking between the two. It's possible someone may have glued that thing in there because of a lack of proper tools.

[Elefantino]

I'm going to go with a sticky pawl.

[TiminVA]

Similar sound happened to me back in the summer. Obviously hubs and bottom bracket were the first things I checked, but it ended up being one arm of the crankset spider was cracked. This was an Ultegra 6800 with around 20,000 miles on it.