Cycling in Sydney Australia
It sometimes happens that I end up with two bikes at work. Some inequality in rides too and from caused by side trips, lifts, taxis and business trips conspire to create this imbalance. For the most part I just wait it out, and it usually corrects itself, but the situation had been going on for weeks, and didn’t seem to be resolving.
So I went with the rather unwieldy option of strapping the fixie to the Radish. This requires removing the wheels, strapping the frame down via the chain stays, and putting the wheels into the panniers. On this occasion I also had rather a lot of other things to carry, so I had to tuck both wheels into the same pannier, which was not 100% straightforward. Still, I managed, and arrived home without mishap.
Or so I thought. When I can to reassemble the fixie, I realised that one of the wheel nuts had gone missing from the front wheel. Damn lawyers. Evidently I had left the nut rather unscrewed, and it had worked loose and dropped off.
I effected a temporary fix by ‘borrowing’ one of the nuts from one of the junior Dan's bikes (sadly she doesn’t ride it much; she’s more a dedicated scooter girl), and then set about ordering a new nut.
Now, this is when it got unbelievably complicated. Apparently no-one knows what size regular bike wheel nuts are. Attempting to google it yields hundreds of threads in hundreds of bike forums with people asking this exact question, and then receiving as many answers as there are types of nut – both literally and figuratively. I was literally unable to find this out. Hub manufactures don’t put in in the specs. Bike shops don’t tell you (and don’t stock them). Even my LBS was unable to help, trying a few nuts out halfheartedly (none of them fit), and then saying they would have to ‘look into it’. Apparently it could be an M10. Or a 3/8″. It might have 24 or 26 threads per inch, or perhaps a pitch of 1.25, or maybe 1.5. Probably not 1.0, except on some bikes. The front and back hubs might be different. Unless they are the same. And BMX and coaster brakes have different nuts. Sometimes. Or perhaps not. It might be 14mm. Or 15mm. Or M9. Or M9.5.
Usually, answers go through a range of options for what it could be, and airily finish with ‘they are all standard, so you’ll have no problem getting one”. Ha! I tried every nut available in Bunnings, and not one of them fit.
Finally, I found the answer. Thank you, Moruya Bicycles. Both for having the information, and selling the damn things. 3/8″ with 26 threads per inch. Outside dimensions 15mm. (Which seems weird to me; a non-metric nut that fits a metric spanner).
Apparently coaster brakes are slightly different, as they had 24 threads per inch. Except junior Dan's bike has a coaster brake, and the nut fits my hub perfectly. I’ve ordered one of each size, to be sure. Now I’m just praying that when they arrive, one of them will fit…
The nuts came this morning. So it seems the nut on my bike is a 3/8" 24 tpi. So it's junior Chillikebab's bike that is 'normal'. If anyone wants a 3/8" nut with 26 tpi, I've got one going spare...!