Has anyone got any views on stub axle diameter? I know most mini-type wheels seem to have a 20mm diameter bearing (well, they do in the UK), but things like ex-moped wheels generally come with smaller bearings, and, though you can put in bigger inner diam bearings, the rollers or balls need to be correspondingly smaller. I've tried 12mm mild steel axles, and they are definitely not strong enough (bent all over the place). The next size up seems to be 15mm. Has anyone had any experience of the strength/longevity of axle stubs of that diameter? I'm a bit reluctant to buy the bearings, and make the axle stubs if they too won't be strong enough.
Axles less than 20 mm need to be made of strong stuff which is why 20 mm is popular
Having said that axles can be made smaller out of mild steel of around 16 mm IF the wheels have spacer tubes between the bearings and the axle nut is done up tight and the yacht is no bigger than mini size.
I successfully used 17mm on a class 5 under the above criteria but just sticking with 20 mm seems the easier way to go
Spacer tubes installed correctly effectively make the outer part of the axle a larger diameter.
Just my suck it and see experience for what it is worth
Thanks - your last comment sums up the value of this forum - loads of accumulated experience...
20mm is good and still use spacer tubes as they help keep the wheels run true