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Something like this? http://www.ebay.co.uk/itm/Bicycle-Wheel-Hub-Axle-Spacers-3mm-or-5mm-Black-or-Silver-Pair-or-Pack-of-Ten-/281148609744?_trksid=p2141725.m3641.l6368 or http://www.ebay.co.uk/itm/Top-Quality-Aluminium-Alloy-10mm-Axle-Spacer-Kit-Convert-Track-Hub-FIXIE-/221864254073?_trksid=p2141725.m3641.l6368
Does Shimano MTB cassette work on road freehub?
amey-
Something like this?
Nothing like that. Look at the exploded view of the FH-5800. The axle doesn't pass through the lock nuts like it used to on old fashioned hubs.
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Does Shimano MTB cassette work on road freehub?
All current Shimano MTB cassettes (including CS-M8000/9000 11-speed) go on a standard 8/9/10-speed HG freehub, you'll need to use the 1.85mm spacer to fit them on an 11-speed road freehub. In general, one might also have dérailleur cage interference with the spokes if one were to use an 11-speed MTB cassette on a road wheel, although in your case moving the hub to the right and reducing the dish should solve that.
gbj_tester
Just 5mm on the left, no need for extra space on the right, but the axle isn't long enough to provide proper support, and 5800 has a modern axle so it doesn't lend itself to being moved sideways or being swapped out for something longer.