Sorry to report that the Aristo ball bearing sets seem to have axles that are to short for most Bachmann trucks.
I bought two pair (not cheap) to use on an Annie tender to power the sound system. It just didn't work out. I thought about putting small plugs in the ends of the truck bearings, but never tried it. I ended up using the LGB spring loaded wipers with the original wheels, while I am sure I have more drag, the 4-6-0 and sound system have performed very well pulling five J&S passenger cars up my steep grades.
Since I Have no Aristo equipment The aristo wheels will go on Ebay one of these days. Hope this helps.
I bought two pair (not cheap) to use on an Annie tender to power the sound system. It just didn't work out. I thought about putting small plugs in the ends of the truck bearings, but never tried it. I ended up using the LGB spring loaded wipers with the original wheels, while I am sure I have more drag, the 4-6-0 and sound system have performed very well pulling five J&S passenger cars up my steep grades.
Since I Have no Aristo equipment The aristo wheels will go on Ebay one of these days. Hope this helps.