pacomotorstuff
Coast to Coast
Re: Tim's SR500 - Nov 11 2010 - first small bump in the road / possible detour
Er, ah,
If it hasn't fallen apart in your hands, I don't think it's a crack. A lot of dirt track spools were / are built out of 3 pieces - the "barrel" if you will and the flanges for the spokes. The separate pieces were designed and machined to have an interference fit. Depending on the manufacturer, the barrel was chilled (frozen) and the flanges were warmed up. A couple hundred degrees difference really moved the dimensions around and the 3 pieces were pressed together in a hydraulic press. Depending on the manufacturer, the parts may have been slathered with a permanent bonding agent as well, just before assembly.
Sounds odd I know. But I've never heard of one coming apart.
Check the other hub flange and see if you see the same thing - I'd like to know. We had that bike going pretty good the last time we rode it and I think one of us would have noticed the "odd" handling as a result of a hub coming apart - there's quite a side load on a dirt tracker pitched into a corner and if there was a problem, it should have shown up.
I do have another spool hub but don't know if it can be used with a disc.
The other alternative already mentioned is the 40 hole street bike hub - I think the Honda 750's and some Kawasakis had them. The spoke flange is a bit larger diameter than your dirt track hub, but the spoke angle difference is probably so modest, you could use your 19 inch rim okay. Check the spoke guages as well - I think the dirt track spokes are a gauge larger. All this stuff can be addressed - it just takes a little thought and time.
Let me know what you find on the other flange, but looking at the photo, I'm pretty sure its a 3 piece hub. I'll check around and get back to you.
Regards,
Pat Cowan.
Er, ah,
If it hasn't fallen apart in your hands, I don't think it's a crack. A lot of dirt track spools were / are built out of 3 pieces - the "barrel" if you will and the flanges for the spokes. The separate pieces were designed and machined to have an interference fit. Depending on the manufacturer, the barrel was chilled (frozen) and the flanges were warmed up. A couple hundred degrees difference really moved the dimensions around and the 3 pieces were pressed together in a hydraulic press. Depending on the manufacturer, the parts may have been slathered with a permanent bonding agent as well, just before assembly.
Sounds odd I know. But I've never heard of one coming apart.
Check the other hub flange and see if you see the same thing - I'd like to know. We had that bike going pretty good the last time we rode it and I think one of us would have noticed the "odd" handling as a result of a hub coming apart - there's quite a side load on a dirt tracker pitched into a corner and if there was a problem, it should have shown up.
I do have another spool hub but don't know if it can be used with a disc.
The other alternative already mentioned is the 40 hole street bike hub - I think the Honda 750's and some Kawasakis had them. The spoke flange is a bit larger diameter than your dirt track hub, but the spoke angle difference is probably so modest, you could use your 19 inch rim okay. Check the spoke guages as well - I think the dirt track spokes are a gauge larger. All this stuff can be addressed - it just takes a little thought and time.
Let me know what you find on the other flange, but looking at the photo, I'm pretty sure its a 3 piece hub. I'll check around and get back to you.
Regards,
Pat Cowan.