HUBS. Ratchet Hubs [, , , ]. Technical Manual. V Maintenance of the Front Wheel Hub [ MTB Predictive Steering]. • Hub technology is equal to DT Swiss. s standard hub. • Rear hub 11 speed, 9/10 speed compatible with hubs. • Two pawl in the hub internal. • Pawls, spring of pawl carrier & needles have to be . Manual clamp. Pneumatic. Locking hubs, also known as free wheeling hubs are fitted to some (mainly older) four-wheel drive vehicles, allowing the front wheels to rotate freely when.

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DT Swiss – s Classic

Also the freehub does not rotate as well. The hkbs is sticking out from the hub body for about 0. There should be almost no gap between freehub and hub body. The cylindrical spacer is present. Locking hubsalso known as free wheeling hubs are fitted to some mainly older four-wheel drive vehicles, allowing the front wheels to rotate freely when disconnected unlocked from the front axle.

When the front hubs are locked, even if no power is sent to the front axle by means of a transfer casethe turning of the wheels will still spin the front axle, differential, and driveshaft, which puts extra load on the engine. In some other vehicles, automatic locking hubs are used which, as the name implies, engage automatically when 4WD is desired.

The advantage to mechanical hubs nubs that they are often considered more robust, and less prone to issues due to maintenance negligence.


Northwind see the seal photo http: The hub is a component where the wheel is directly mounted to, and is outside the axle. The benefits of unlocking hubs for normal road use are mainly found in increased fuel efficiency.

And freehub barely moves when QR is locked. Views Read Edit View history.

Product Manuals

240a And that is in place. Anything I should check? As soon as I release the quick release — no friction and wheel spins forever, even with freehub clicking. I can see them working in, say, a Crossmax hub with that weird adjustable sideload thing they do.

And lastly, is the seal in the hub fully recessed? Mechanically activated locking hubs are activated by hand by turning a switch on the end of the axle. This might not be possible if the vehicle gets completely stuck before the hubs have been engaged, meaning automatic hubs require more caution on the driver’s part.

This is done to reduce the mechanical resistance of the front-portion of the drivetrain when four-wheel drive is not in use. Bering installation on DT Rear Hub — does not spin under load.

Bering installation on DT 240 Rear Hub – does not spin under load

Automotive accessories Four-wheel drive layout. Retrieved from ” https: Could it be due to the new bearings? Is that present, and is the threaded doofer the right way up?

Got them into bike frame, pulled tight the quick release and the wheel does not really spin anymore. Thinking about it a bit more — angular bearings suspect does make sense, but these should not block the freehub from moving when under load.


For reference, schematics are here: The disadvantage with this system is that most designs require the vehicle to move some distance usually a whole wheel turn, often going backwards after engaging the hubs in order for the hubs to engage or disengage.

Northwind Flat washer over the bearing and and under the ratchet thready thing — it is present. Other benefits also include keeping the front-differential free from unnecessary wear, quieter operation, less vibration, and lower wear in other drive line components. I suspect it is the bearings indeed.

Bering installation on DT Rear Hub – does not spin under load – Singletrack Magazine

Thus suggesting it is not just bearings — something else is creating friction on freehub. The disadvantage of this is that the driver needs to get out of the vehicle to activate the hubs. Well, it does, but stiffly — I can hear how it spins and it does not spin for long. Also, in some axle designs such as those manal on older Land Roversthe top swivel bearing can become starved for lubrication which is normally supplied by oil slung up by the rotating axleunless the hubs huvs locked every few hundred miles.

Viewing 15 posts – 1 through 15 of 15 total. Yep, checked that — all the spacers are there.