Yeah having had a look around at other machines using them Ive seen a lot of recommendations saying to support the wheel with a bearing on at least one side. Im planning on using them in a 6kg bot so hopefully a simple bearing will suffice.

Ive just had a few parts delivered for the new drum setup in Drumroll and impluse bought a computer on eBay which took a bit more out my bank than I budgeted for so these wheel setups may take a back seat for the next few weeks but thanks for the info Dave and Gary. Ill bear it in mind when I get back round to using the Bosches