question on DTSwiss 240 rebuild

[Rebel_Biker]

I went out for a ride today and on the first steep climb, my rear hub totally stripped and I limped home until a small hill finished it off. The ratchet system is totally stripped.

I will have to take it apart tomorrow and see the damage.

Do I need any special tools to replace the ratchets and springs?

[henrypretz]

The ratchets and springs are replaceable completely tool free. The bearings might require a proprietary tool <-- could be wrong on this last thing.

[oldpotatoe]

Originally Posted by henrypretz

The ratchets and springs are replaceable completely tool free. The bearings might require a proprietary tool <-- could be wrong on this last thing.

The only thing proprietary is the tool that removes the toothed ring that the disc engages. Punch to take bearings out, press to put them in. Toothed ring threaded in, threads out. Discs and springs are steel, doubt they are cooked.

What failed?

[AngryScientist]

wow, twice in one day i get to use this picture.

the ratchets are probably gummed up and the teeth are skipping. DT hubs have to be the easiest ones to work on. take it apart, i bet the problem will be super obvious once you pull it open.

[velomonkey]

Originally Posted by Rebel_Biker

Do I need any special tools to replace the ratchets and springs?

Answer: No. DT Swiss is like the best rear hub ever to do this type of stuff. Look at the Youtube videos - wicked easy to do.

[Rebel_Biker]

Originally Posted by oldpotatoe

The only thing proprietary is the tool that removes the toothed ring that the disc engages. Punch to take bearings out, press to put them in. Toothed ring threaded in, threads out. Discs and springs are steel, doubt they are cooked.

What failed?

I will take it apart tomorrow in the shop. On a steep climb it started skipping like when a clutch in a car is going.

Then it worked on a short flat but the next hill it skipped a bit and then lost all engagement and I had to hike the bike home.


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[Rebel_Biker]

Originally Posted by AngryScientist

wow, twice in one day i get to use this picture.

the ratchets are probably gummed up and the teeth are skipping. DT hubs have to be the easiest ones to work on. take it apart, i bet the problem will be super obvious once you pull it open.

Sounds like my problem. Did you just have to clean it up or replace the ratchets?


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[velomonkey]

Originally Posted by Rebel_Biker

Sounds like my problem. Did you just have to clean it up or replace the ratchets?

Clean them, inspect them, test them - good news if they are stripped and really will not engage, they can be replaced.

[Rebel_Biker]

Originally Posted by velomonkey

Clean them, inspect them, test them - good news if they are stripped and really will not engage, they can be replaced.

Thanks

I see the replacement parts at BTI. Then I noticed that DT had a hub tool set and I was getting nervous that I might need a specific tool. But it looks like they have some bearing tools and spindle clamps that can be used in a vice to make a rebuild easier.


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[velomonkey]

Originally Posted by Rebel_Biker

Thanks

I see the replacement parts at BTI. Then I noticed that DT had a hub tool set and I was getting nervous that I might need a specific tool. But it looks like they have some bearing tools and spindle clamps that can be used in a vice to make a rebuild easier.

Bearings totally seperate and as others said it sounds like your ratchet system which is wicked easy. Here is the video where I learned

https://www.youtube.com/watch?v=g8ZQJS0IQM0

BTW, side note: my favorite wrench in college is still a good buddy - he has a set of 240 hub wheels and didn't ride them cause they were too loud - I showed sent him that video, he greased 'em and fell back in love with them. They are totally different than anything else out there, but they totally work.

[Rebel_Biker]

Thank you


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[dustyrider]

I live down the way from dt USA. They're cool people and very, very helpful.
The special tools make a complete rebuild time into a total blur, but most likely you won't need them. Like OP says(of course!); you won't likely need to pull the toothed ring and common tools are adequate.
The viscosity of the grease, or complete lack of grease, are the usual issues I've seen. I'd think maybe a spring based on what you're describing, and it's likely they're fine just hindered(grease). All parts easily found!

[Rebel_Biker]

Here are some pictures when I took the hub apart. I cleaned up everything, re-greased and put it all back together.

Once back together the skipping continued. I had a road dt240 set that I disassembled and put on the hub that was slipping. Everything worked fine. I think the free hub may have be stripped, but it is hard to tell.

[oldpotatoe]

Originally Posted by Rebel_Biker

Here are some pictures when I took the hub apart. I cleaned up everything, re-greased and put it all back together.

Once back together the skipping continued. I had a road dt240 set that I disassembled and put on the hub that was slipping. Everything worked fine. I think the free hub may have be stripped, but it is hard to tell.

I think the discs are worn out, smoothed, not engaging tightly anymore. Get new discs I'd say.

[Rebel_Biker]

Originally Posted by oldpotatoe

I think the discs are worn out, smoothed, not engaging tightly anymore. Get new discs I'd say.

agreed

I used the road discs, free hub, and springs. I will re-build the road hub with new parts. I wanted to convert it to an 11-speed free hub anyway.

thanks OP