Rear sprocket and hub issue

[PedalUma]

Off topic. Versa Mounts to the rescue for me today. A guy as a large battery on his Trek MTB that he rides hard on Mt. Tam. The lower bottle boss broke free of the frame. It used three Topeak Versa Mounts and it is good. He also flipped the bike to install the front wheel. And broke the display. I will solder in a new one. @PCeBiker, this display is six wires. I solder then heat shrink with 2mm 4:1, then three go up and three go down then the whole thing gets 5mm marine grade. It is hard to tell anything happened.

 

[Gionnirocket]

I'll replace the pawls however, are they universal for a sram 9sprocket cassette? Newbie here so be gentle.

That's where we're the same... No eye dear?
I'd start with contacting Sram and/or a local bike shop.
There's a few bike mechanics in this thread (I just play one online) that I'm sure can point out the next step more decisively.

 

[PCeBiker]

Could be the reason but not sure.

All three pawls were broken in the same way with a piece of each pawl still intact.

I'm thinking that the unbroken parts of the pawls weren't engaging the hub notches fully?

I think you've got an alignment issue.

Perhaps that washer being in the wrong spot?, but if it's a shim washer, it may be needed to keep things spaced out properly to prevent binding or rubbing of the cassette and hub face?

 

[PCeBiker]

When you removed that washer, the pawls probably seated in a bit deeper, so the three unbroken bits of the pawls could engage the hub notches, and it started ratcheting again?

 

[PCeBiker]

There's a few bike mechanics in this thread (I just play one online)

I'm no bike mechanic either.

I just like taking things apart to see what makes them tick.
And a freehub actually does tick, so it's right up my alley.

 

[Yodaman1]

When you removed that washer, the pawls probably seated in a bit deeper, so the three unbroken bits of the pawls could engage the hub notches, and it started ratcheting again?

Yes, its very solid. When I spin the sprocket in reverse, should there be a slight metal on metal sound?

 

[PCeBiker]

Yes, its very solid.

It's probably just these three bits of the pawls grabbing making it grab and feel solid,..

When I spin the sprocket in reverse, should there be a slight metal on metal sound?

Yeah, a bit of a clicking noise.
If you put some light grease on the pawls, it kinda muffles the sound.

 

[PCeBiker]

Thinking about this some more.

You probably can't delete that washer because it's probably a shim washer to make sure everything is snug when you tighten up your through axle.

Your cassette/hub probably won't be snug.

If it were me, I'd try to install that washer on the other side of the cassette to bring it deeper into the hub (as long as it doesn't bind on something.)

You might be able to install it under this removeable lock nut to move the cassette inward without leaving any slack along the axle?

It's got flats on it to get a wrench on it so you can possibly put it underneath the lock nut instead, to keep the overall axle length the same but move the cassette inward?


I'm just sorta speculating.
I don't know exactly what connects to what, or what parts tighten onto what, but I'm pretty sure that the pawls should be seating deeper into the notches in the hub.

That's probably at least partly why they broke in the first place.

 

[PCeBiker]

The axle on my hub motor has two diameters and a shoulder that gets the shim washer,..

The shim washer allows the axle to be tightened with the inner diameter getting huge torque from the axle nuts, and the outer diameter snugs up just enough (using the shim washer) that the axle bearings aren't binding or too loose and sloppy.

You've got something like that going on with your freehub, so you can't really delete that washer.
But you might be able to move it??

 

[Gionnirocket]

If you can track down the exact hub/cassette part numbers and paperwork you should be able to see what parts can be ordered and in what order the spacing washers are installed.
You can try the bike seller / SRAM / a local bike shop
Even though an ebike... I'd guess the wheel is a standard build.

 

[fooferdoggie]

go to a good bike shop they may have them on hand.

 

[PCeBiker]

go to a good bike shop they may have them on hand.

And bring the sprockets/ratchet part with you for reference.

 

[Yodaman1]

When you removed that washer, the pawls probably seated in a bit deeper, so the three unbroken bits of the pawls could engage the hub notches, and it started ratcheting again?

Yes very solid.

It's probably just these three bits of the pawls grabbing making it grab and feel solid,..

View attachment 200242




Yeah, a bit of a clicking noise.
If you put some light grease on the pawls, it kinda muffles the sound.

Here are the pawls. As several people commented, it's better to replace them. Going to a bike shop tomorrow. Fingers crossed they have what I need in stock. Thanks everyone for your help.

 

[PCeBiker]

Here are the pawls. As several people commented, it's better to replace them.

For sure, but I'm almost positive that the pawls aren't fully meshing with the notches in the hub.
That's why all three pawls still have a piece still intact.

I think that your axle is like this from the video link posted earlier ?,..

Maybe you can install that spacer washer on the other end of the axle ??

Maybe you should bring the whole wheel into the shop so they can take a look at it.



EDIT: If you put the spacer washer on the other end of the axle, you'll move your brake rotor in by the thickness of the washer.
Then you'd have to adjust your brake caliper.

 

[PCeBiker]

It looks like your pawls are only meshing with hub notches by just over half way.

There's something wrong there.

 

[Yodaman1]

Yes

When you removed that washer, the pawls probably seated in a bit deeper, so the three unbroken bits of the pawls could engage the hub notches, and it started ratcheting again?

Yes sir.

 

[indianajo]

There's something wrong there.

Grey metal, not steel. Pawls should wear round, not fracture. 99.999% of cheap parts are the former. Dealers will not allow you to know where the parts come from before you open the box and see the label, but grey metal from China has lead, tin, brass, copper, from the car batteries wiring and decorative parts in the melt. A poster on here from an ag equipment manufacturer was sent to China to find out why there was glass in their engine blocks. The measured ingredients in the melt were fine. The floor sweepings poured in the melt, including glass bottles from break time, were not.
The DTSwiss spokes I bought were made in USA and did not break. The **** spokes that come on cheap bikes OEM, do, under my enormous 180 lb. I do not jump rocks, curbs, or picnic tables. It is not the diameter of the spoke that matters, it is whether it is steel or not.

 

[PCeBiker]

@Yodaman1
Can you update this thread about what happened with your wheel.

I'm quite curious to know what the "professional bike mechanics" think?

 

[Yodaman1]

@Yodaman1
Can you update this thread about what happened with your wheel.

I'm quite curious to know what the "professional bike mechanics" think?

I had to get a new drum as the pawls aren't sold individually. Plus, I ordered an upgrade. DT Swiss HG Ratchet LN Upgrade Frhub Kit
18t Ratchet Kit, Shimano HG, Aluminum Waiting for delivery today and I'll let everyone know how it went. Thanks again.

 

[Gionnirocket]

'f_ń Sram
Glad you're upgrading and moving forward.

I wonder if these universal kits are worth exploring.

Amazon.com : Yuauy 2 pcs Bike hub Pawl Spring Freehub Ring 26mm +16 pcs R1.45 R2.4 R2.5 Bicycle Tower Base Hub Cassette Driver Spring Claw Road Mountain Bike Replacement : Sports & Outdoors

Amazon.com : Yuauy 2 pcs Bike hub Pawl Spring Freehub Ring 26mm +16 pcs R1.45 R2.4 R2.5 Bicycle Tower Base Hub Cassette Driver Spring Claw Road Mountain Bike Replacement : Sports & Outdoors

www.amazon.com