klassard
Member
The HD Hub is not I.S.O. thread.
I gave Jeremy at bicycle-engines a call today. I was told that he is their technical expert. He told me that it is normal for the freewheels to get stuck and that I should just chain them up and pedal them to force them on. Unfortunately, this solution damages the threads if they aren't correct.
I've confirmed today that the threads are not I.S.O. threads. I took a freewheel from a Chinese electric scooter and tried it. It went on like butter. Unfortunately, it didn't have bike teeth. So I ordered one from this site - http://www.scooterparts4less.com/web_electric/freewheel_hub.htm
It came in the mail today. It also went on like butter.
Here's the clincher:
The Chinese electric scooter freewheels don't fit on any of my normal bike hubs, but they fit perfectly on the Grubee axle. My other normal freewheels from my regular bikes are completely interchangeable with any of my hubs EXCEPT the Grubee.
The Grubee hub has some kind of non-standard thread that is shared by Chinese scooter hardware and not by bicycle freewheels.
This means that either the 100s of people birddog that distributing says buys their hubs are forcing freewheels that don't fit and inadvertently ruining their threads or the hub I received was an anomoly that got shipped to bicycle-engines.com by mistake and the majority of their hubs do in fact have ISO threads and I was just unlucky.
I gave Jeremy at bicycle-engines a call today. I was told that he is their technical expert. He told me that it is normal for the freewheels to get stuck and that I should just chain them up and pedal them to force them on. Unfortunately, this solution damages the threads if they aren't correct.
I've confirmed today that the threads are not I.S.O. threads. I took a freewheel from a Chinese electric scooter and tried it. It went on like butter. Unfortunately, it didn't have bike teeth. So I ordered one from this site - http://www.scooterparts4less.com/web_electric/freewheel_hub.htm
It came in the mail today. It also went on like butter.
Here's the clincher:
The Chinese electric scooter freewheels don't fit on any of my normal bike hubs, but they fit perfectly on the Grubee axle. My other normal freewheels from my regular bikes are completely interchangeable with any of my hubs EXCEPT the Grubee.
The Grubee hub has some kind of non-standard thread that is shared by Chinese scooter hardware and not by bicycle freewheels.
This means that either the 100s of people birddog that distributing says buys their hubs are forcing freewheels that don't fit and inadvertently ruining their threads or the hub I received was an anomoly that got shipped to bicycle-engines.com by mistake and the majority of their hubs do in fact have ISO threads and I was just unlucky.