New derailleur time??
Author
Discussion

Bill

Original Poster:

57,955 posts

281 months

Tuesday 2nd June
quotequote all
I can't get my head round what the issue is. They've been a bit off for a while but since I replaced the chain (almost at 1% longer...) it's now going into the bottom gear one early and will pop off the big ring if I then go one more down. It's like the stop screw has been loosened +/- the cable tightened.

It does seem like the pivot what it attached to the hanger has more play than my other bikes and the bottom of the derailleur is closer to the wheel. It's an SRAM NX 11 speed and I've been through 3 or 4 chains IIRC and one cassette and crankset in its life.

I've pretty much persuaded myself while typing this out that it's buggered so is there a worthwhile straightforward upgrade?? I'll do the cable inner while I'm at it.

Jme1990

6 posts

2 months

Tuesday 2nd June
quotequote all
Might be worth replacing the rear mech hanger before you replaced the derailleur? If that's not perfectly straight, tends to throw all your gears out.

Bill

Original Poster:

57,955 posts

281 months

Tuesday 2nd June
quotequote all
Hmmm, in a further update the cassette is wobbly! eek

boyse7en

8,066 posts

191 months

Tuesday 2nd June
quotequote all
Bill said:
Hmmm, in a further update the cassette is wobbly! eek
New freehub bearings required?

Bill

Original Poster:

57,955 posts

281 months

Tuesday 2nd June
quotequote all
Yes, got the cassette off and it seems that way.

Bill

Original Poster:

57,955 posts

281 months

Tuesday 2nd June
quotequote all
But a new freehub seems relatively cheap? The hub bearings feel rough too.

It's a 2017 Whyte 901, spec sheet found online says "Double Sealed Cartridge Bearing Hub, 12mm X 148mm Boost Through Axle, 32 Hole"

Any ideas how I go about this would be appreciated!!

Bill

Original Poster:

57,955 posts

281 months

Tuesday 2nd June
quotequote all
Hmmm. Google not helping much...





Assume it's push fit on the axle but it has loose bearings and small collars either end. The hub side collar has flats for a spanner.

boyse7en

8,066 posts

191 months

Tuesday 2nd June
quotequote all
The freehub has two bearings in. The size will be printed on the face of them, and they are usually readily availble from bearing suppliers online much cheaper than from bike shops.

You need to tap the first bearing out using a hammer and suitable drift/blunt screwdriver, then remove the internal circlip so you can tap the second one out.
Clean it all up and tap the new bearing in using a hammer and suitable size socket or the old bearing to make sure it goes in straight. Fit the circlip and if there is a plastic spacer, don't forget to put it in before you tap the outer bearing into place!

Edit: your second picture is the wheel bearings, not the freehub bearings. Is it those that are graunchy?

Edited by boyse7en on Tuesday 2nd June 16:21

Bill

Original Poster:

57,955 posts

281 months

Tuesday 2nd June
quotequote all
Yep hub bearings also grumbling. Not sure how to get them out as they're flush and a long screwdriver doesn't catch.

Free hub also borked. Loose bearings (13 if that gives a clue to size?) and the outer bearing face is knackered:


Bill

Original Poster:

57,955 posts

281 months

Tuesday 2nd June
quotequote all
Found a part number, but Whyte's website lists free hubs and says it's been discontinued but replaced with a new version.


P-Jay

11,311 posts

217 months

Thursday 4th June
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Bill said:
Found a part number, but Whyte's website lists free hubs and says it's been discontinued but replaced with a new version.

That's good news, generic non-branded hubs can be a nightmare for parts.

To remove the hub bearings, typically you'll need a punch tool to bang them out from the other side. Don't use a screw driver or there's a good chance you'll end up with a smashed bearing and the outer race stuck in the hub, which is a world of pain to sort.

boyse7en

8,066 posts

191 months

Thursday 4th June
quotequote all
If it's any help, the freehub bearings on my bike were 61903-2RS, and a pair of them cost me under £5.
I don't remember any branding on the freehub, but they are Fulcrum wheels.

Bill

Original Poster:

57,955 posts

281 months

Thursday 4th June
quotequote all
Thanks. I've ordered a freehub from Whyte as I got nowhere on Google with the numbers.

Also got the hub bearings out using a rawl bolt (cunning tip from YouTube) to move it initially and the a screwdriver (sorry) to punch it out. Also got those on order.

And a new derailleur as there's loads of play in it and the spring is weak.

Bill

Original Poster:

57,955 posts

281 months

And it's now back together. Oddly enough it's a remarkable transformation. It's like it's new again. hehe