DT Swiss has publicly acknowledged an issue with its new Ratchet EXP rear hub internals where the premature wear of the ratchet drive rings caused restrictions to the engagement in some cases.
> Your complete guide to DT Swiss wheels
Hubs affected
DT Swiss standard products:
- ARC 1100 / 1400 DICUT
- PRC 1100 DICUT Mon Chasseral
- XRC 1200 / 1501 SPLINE
- XMC 1200 / 1501 SPLINE
- EXC 1200 / 1501 SPLINE
- 180 Components hub
- 240 Components hub
- SERVICE KIT RATCHET 36T EXP W/O TOOL
- SERVICE KIT RATCHET 54T 180 EXP W. BEARINGS
- SERVICE KIT RATCHET 54T 240 EXP W. BEARINGS
- SERVICE KIT RATCHET 54T EXP W/O TOOL
What does this mean? Essentially the ratchet rings that usually engage when you pedal - but slide over each other when freewheeling - have in some cases been wearing out, and eventually failing to engage when you go to pedal. That’s far from ideal as you’d be left unable to go anywhere.
Initially, DT Swiss says that they were not able to explain what was causing the issues. After all, their Star Ratchet technology has been working incredibly consistently for years, and DT Swiss has rightly earned a reputation for producing bombproof hubs.
The issue, DT Swiss believes, has been identified: "Variations in the surface finish of the ratchets that are in a completely normal range for the traditional and established systems are potentially leading to premature abrasion of wear parts in the new Ratchet EXP system," it says.
“This premature wear can then lead to restrictions of the engagement in individual cases, which can be remedied by a simple replacement of those wearing parts.”
If this is indeed the case then it could be a simple issue to fix, but could potentially have much more troubling implications for DT Swiss. The good news is that the ratchets are a relatively inexpensive part of the hub. This is also a rather easy part to replace and owners of affected hubs should be able to perform the replacement at home should they have decent workshop skills.
The worry comes with the phrase “in a completely normal range for the traditional and established systems.”
This is a far more concerning issue for DT Swiss, as it could suggest that there may be an underlying issue within the Ratchet EXP hubs. This could be causing the ratchets that worked just fine in the old hubs to, in some cases, fail in the new hubs.
The new DT Swiss 240 Ratchet EXP hub moved to a system that requires only one spring to align the ratchets, whereas the previous system required two conical springs. This, DT Swiss claimed at the time of launch, “results in faster full engagement and eventually reduces wear.”
> DT Swiss 240 EXP hubs claim 15% improvement in axle stiffness
While in the short term DT Swiss can ask owners of the affected hubs to keep an eye on their wheels and replace the ratchets should any issues arise, they will want to find out why a part that worked well in the old hub is now prematurely wearing in the new design to avoid a potential dent in its reputation.
While DT Swiss lists the above hubs that should be checked, there is no word on OEM brands that use DT Swiss Ratchet EXP internals.
DT Swiss has provided a link to its service manual, explaining how to disassemble the hub and how to inspect the ratchets for wear. The official advice, however, is to take any wheel that doesn’t appear to be working correctly to a DT Swiss service centre for a free inspection, or contact them here.
dtswiss.com
I don't think the average driver who looks at their phone while driving is really going to look at a CM video and go, oh no - here's a vigilante...
Hardly a farce. It's unhelpful to suggest a cycling helmet could mitigate a brain injury in a collision with a vehicle, because they're not...
I love my storage bottle and overcame the 'fiddly bit' of getting things in and out by putting it all into a Alpkit Banicoot Pouch (other small...
Police: What were you doing 4 months ago?...
Checking the legislation, it was amended in 2003. ...
It's an Audi - "they all do that, sir", and so a warning letter will probably have little effect. Sorry, but I would have sought a NIP....
I think it might actually be the least popular behaviour in all of web design.
Here's some hope for us chunky blokes, even if most of won't consider spending £3.5k on wheels.
If running it poorly affected their salaries and bonuses (and other accountabilities) maybe they would run it properly......
Passing a cyclist in the opposite direction warrants at least a nod or a gentle lift of the hand from the bars. But what about overtaking a fellow...