Shimano hub locknut conundrum

[robjh]

Normally to get into a hub for servicing I use two spanners to unlock the locknut+cone assembly, by twisting in opposite directions - the standard way.

However the Shimano 105 hubs on a rear wheel that I bought in 2019 have no flattened area on the locknut for a spanner to grab onto - see the picture.

Is this normal for new Shimano hubs? The only solution I can see is to hold the locknut in a vice to undo, and replace it with a spanner-friendly one next time.

Any other ideas?

 

[Jody]

The adjustment is either from the other side or it's running cartridge bearings and that part slots in. Check to see if it pulls out by hand.

 

[Deleted member 1258]

Whats the other side like? Will the axle pull out once you've undone the other side?

 

[Ajax Bay]

Don't think Shimano 'do' cartridge bearings.

 

[Jody]

Don't think Shimano 'do' cartridge bearings.

Just read that

OP this might help depending on which 105 hub you have

https://si.shimano.com/api/publish/storage/pdf/en/dm/HB0003/DM-HB0003-06-ENG.pdf

 

[Darius_Jedburgh]

Doesn't take Allen Keys does it?

 

[Ajax Bay]

OP this might help depending on which 105 hub you have
https://si.shimano.com/api/publish/storage/pdf/en/dm/HB0003/DM-HB0003-06-ENG.pdf

Page 13 of 17, maybe.

 

[Cycleops]

What’s under that rubber cover? Very odd to have no flats.

 

[iluvmybike]

Allen key in each end

 

[robjh]

Found it! It does indeed take an allen key in each end, so that's what I'll be doing this evening.

In many years I've never come across one of these, so it's not something I thought to look for. Thanks to the collective mind of CycleChat for helping me out there.

 

[I like Skol]

Found it! It does indeed take an allen key in each end, so that's what I'll be doing this evening.

In many years I've never come across one of these, so it's not something I thought to look for. Thanks to the collective mind of CycleChat for helping me out there.

Please take some pictures of the parts once dissassembled. Never seen this from Shimano before, Even my 105 12mm thru axle still has cup & cone bearings with the near normal cone & locknut arrangement.

 

[Ajax Bay]

Page 13 of 17

 

[robjh]

Please take some pictures of the parts once dissassembled. Never seen this from Shimano before, Even my 105 12mm thru axle still has cup & cone bearings with the near normal cone & locknut arrangement.

Here as requested by @I like Skol is a picture of the whole axle assembly. The r/h end is the non-drive side showing the order of components. The job actually needed an allen key and one spanner and then all made sense.
It's a FH-5800 whereas my others were FH-5700 and 5600s.

 

[I like Skol]

Presumably the axle is almost exactly the right length and the cone has flats for a normal cone spanner while the locknut is tightened by Allen key? I like it, the axle end to frame interface is much improved over the old threaded stump with conventional hubs.

 

[Paulus]

This is something I have never seen, so I have learned something new today .
Never to old to learn something.