The hub is LX M563 on Mavic 221 rims.
I bought the wheels from trek_y back in November last year (2012)
This is the sale thread;viewtopic.php?f=2&t=231596
This is how the wheels have been described;
Wheels - Deore LX M563 black hubs, Mavic 221UB rims, DT spokes - hubs nice and smooth, no dings or wobbles, come with Shimano classic chrome skewers. £55. Or £65 with Specialised Nimbus 1.5 semi slicks, tubes and 8 speed cassette as shown.
All I did was change the cassette to a 9 speed one and put new set of Continental's on.
The guy at the LBS who fit the gears up for my boy ( a few months back) said the long cage rear mech will have problems - that a med cage would be better.
I wonder if that's the problem?
The cassette is a brand new HG unit from CRC.
What happens is that riding at a leisurely pace, nothing, as soon as i put some welly in it - I can pedal, after say every other revolution (sometimes every rev, sometimes nothing for 3 revs - intermittent) what happens is that on the downward push of the pedal something at the rear will slip and the pedalling motion will be distracted as it seems something has 'given' and the crank (and thus my foot on the pedal) will slip down a short way from say (imagining the pedal revolution is a circle ((which it is)) 60' to 120' degrees.
And on the middle chain ring, this was happening when geared on the smaller cogs.
When I slackened the chain some more by changing gears- on the smallest chain ring, pedalling was fine.
I need to check;
a) the chain line and BB spindle length (what size Bottom Bracket would be for these cranks which are fitted?)
b) chain size - too many links?