DT 240 Freehub and Shimano Lock Ring Stripped

[pjmsj21]

I have now had two occassions where I have likely stripped the freehub on a DT 240 hub when changing Shimano cassettes. I grease the lock ring on the cassette and have been very careful but about not forcing it, if there is any resistance when tightening it. It seems pretty straightforward, but surprised that I am now replacing the freehub once again. I am sure its likely Operator Error but would appreciate any insight. TIA

[AngryScientist]

this may be an obvious question, but are you certain you are not trying to use an 11-sp cassette on an older 10-sp freehub?

the only way i can imagine stripping lockring threads is by trying to get a lockring on a 10-sp freehub without enough thread engagement.

you should be able to thread in the lockring by hand several revolutions before meeting any real resistance, and once you've got the threads engaged properly, there is no reason you should be stripping theads...

[boywander]

Can you post pictures of the “stripped” threads.

[p nut]

Surprising. I’ve changed cassettes/cogs multiple times on 240 hubs. First few times, I hamfisted it pretty good. Never stripped the threads.

[tony_mm]

Which kind of 240s are you using? Road or MTB
Which kind of cassette are you using? 10 or 11 speed? Road or MTB (or the 11-34 Ultegrq for example)?

[pjmsj21]

Originally Posted by boywander

Can you post pictures of the “stripped” threads.

OP here....a couple of pics. Yep I am using an 11 speed SHmiano cassette and this is a 240 road hub in a DT Swiss RC 38T wheelset. I have changed the cassette a number of times without issue but it seems more problematic than what I experience with my Campy wheels.

[tony_mm]

And you don't use a 11-34 cassette, don't you?
(The 11-34 cassettes have the MTB specs and need a spacer when mounted on a road freehub)

[DrSpoke]

As AngryScientist was alluding to, Shimano increased the width of their cassette when they went from 10sp to 11sp - 1.85mm if I remember correctly. Accordingly, they increased the width of the freehub body. So there are now two widths for road freehub bodies. Be sure you have an 11sp freehub body for your 11sp cassette. DT Swiss labels the freehub so it should be easy to identify. And you would have major issues if you are trying to install an 11sp cassette on a 10sp freehub.

You can put a 10sp cassette on an 11sp freehub but, as stated above, you need a spacer - a 1.85mm spacer. The Shimano 11sp 11-34 cassettes uses the old 10sp road and current 11sp mtn width. This is possible because the largest cog can be moved closer to the spokes without causing interference.

[pjmsj21]

OP here...as stated it is marked on the hub clearly it is an 11 speed. I will replace the freehub and it not appears as if a steel version is available. It seems like the steel version would be best for my needs? thoughts?

[pjmsj21]

OP here...as stated it is marked on the hub clearly it is an 11 speed. I will replace the freehub and it not appears as if a steel version is available. It seems like the steel version would be best for my needs? thoughts?

[zmalwo]

One thing that really puzzles me about the Shimano freehub is that when they went from 9 speed to 10 speed the length of the cassettes actually decreased by 1mm if I remember correctly. Then when they came out with 11s the cassettes are now longer than both 9 speed and 10 speed. it makes me wonder wth is going on.

[Mark McM]

Originally Posted by zmalwo

One thing that really puzzles me about the Shimano freehub is that when they went from 9 speed to 10 speed the length of the cassettes actually decreased by 1mm if I remember correctly.

Not according to Sheldon Brown's Cassette Spacing Cribsheet. When going from 9spd to 10spd, Shimano cassette width increased from 36.5mm to 37.2mm. For both Shimano and Campagnolo, fitting wider 10spd cassettes on 9spd freehubs was done by overhanging the big sprocket past (inboard of) the bottom of the freehub splines.

Every increment in the number of sprockets has resulted in a wider cassette. And with every few increases in the number of sprockets, the rear wheel dish has been increased to make room