DT Swiss 240 rear hub bearings

So my 2018 (non EXP) 240s (straight pull hub) rear hub needs new bearings

According to the DT Swiss diagrams Ive seen the drive side hub bearing and the non driveside hub bearing are the same (6902 bearings)

But on my hub the non drive side bearing has a smaller outer diameter and its not as deep as the driveside bearing

In fact the non driveside bearing is actually the same size as the two bearings used in the free hub body

Anybody else had this and why do DT Swiss not show this in their diagrams?

They’re usually the same, for a standard 240, presumably it’s a model-specific difference… Just had a week look on DT’s website for the manuals and tbh it’s a complete mess trying to find the exact right hub- are you sure there’s not another listing for your model?

I think the spline ones are different (or rather, like yours)

I take it you’ve looked here?

https://www.dtswiss.com/en/support/product-support

Ahh yes mine are the spline version

They are DT Swiss EX1501 wheels with 240 straight pull hubs

Wonder why DT decided to use a different size bearing on the non drive side

I take it you’ve looked here?

https://www.dtswiss.com/en/support/product-support

Yes but all the user manuals i could find for my wheels didn’t have the bearing size or even an exploded diagram of the rear hub showing different bearings for drive and non drive sides

escrs
Free Member

Wonder why DT decided to use a different size bearing on the non drive side

Smaller bearing means smaller hubs and vice versa, you can shed a few grams, or tailor it more to the specific job- tweak the flange size for more even spoke lengths and tensions frinstance. The universality and usefulness of the relatively big standard 240, vs the specificness and tailoredness of the purpose built ones- and advantages and disadvantages of both.

(kind of an aside but this is where you see some real Bike Industry Bullshit- “Boost hubs mean the flanges are wider apart so there’s better triangulation for spokes which can make a stronger wheel”. Oh OK, sounds legit, and presumably hubs are also designed with the same thing in mind to give more triangulation? Right guys? Right?)

On the link I sent you, under spares, you need to find the hub and click on the ‘show components +’ button to see all the individual hub bits, including the bearings.

It’s easy to miss on fairness.

According to that link, a boost, centrelock XM1501 spline needs 1 x 6802 and 1 x 1526 bearing.

Cheers, Ive found it

https://www.dtswiss.com/en/support/product-support?matnr=WEX1501TFDRSO06055

I have recently changed mine and they are a uncommon size which are MR1526, I needed mine same say so got them from simply bearings.

You will need the tool to remove the ratchet thing to remove the hub bearings I think

You will need the tool and the hand of God if it’s been a while. I ended bending my axle trying the get the ratchet ring out and broke two tools. Even the impact wrench wouldn’t shift it!

I ended up getting a new hub and rebuilding the wheel…

You will need the tool to remove the ratchet thing to remove the hub bearings I think

Not on my particular 240 hub, i can tap the bearing in and out with the ratchet ring in place, done it twice now when trying 2 old 6802 bearings i found in the spares box

Think it maybe older 240 hubs that need the ratchet ring removed to enable you to tap the bearings out