Grinding from rear wheel - servicable?

Anonymous

Hi all,

After a more careful strip down and inspection of my bike, it turns out the freewheel (not freehub, although could be that too) is making a god awful crunching sound. It occurs while pedalling and freewheeling which is what makes me think that it is the bearings in the wheel axle itself.

I have Ultegra 6500 hubs with Kronos Vuelta rims, and was wondering how hard it is to open her up and replace the insides.
If not, I have seen some good deals on the 7900 hubs somewhere, so was going to replace it with one of those (a rear hub for life, I have been told) if I can't repair it, and have it rebuilt onto the same rim.

Cheers for any thoughts - and if it is hard and not to be undertaken by mere mortals, or can you recommend someone who can turn it around quickly.

sungod

6500 hub exploded view...

http://techdocs.shimano.com/media/techd ... 611839.pdf

...shows you which bearings you need, you can buy here...

http://www.sjscycles.co.uk/ball-bearings-dept428/

if it just needs cleaning, greasing and new ball bearings it's straightforward, cones can be replaced too, but if the cups are worn it's a rebuild

there's a good how-to guide here with plenty of pics...

http://www.parktool.com/blog/repair-hel ... adjustment

...you just need the cone spanners (thin spanners) and some grease

Anonymous

amazing. Thanks very much!