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Author: Subject: how to measure castor
macspeedy

posted on 12/4/04 at 08:34 PM Reply With Quote
how to measure castor

Has anyone come across a cheap and easy way of measuring castor?
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JoelP

posted on 12/4/04 at 08:49 PM Reply With Quote
i did mine by letting the upper bone drop down to the lower bone, and then measuring in mm the difference from b/j centres. Then measure the height of the hub and do the trig. Or just believe the people who say it boils down to 21mm. I think it was 21 anyway, that or 25...!






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Mark Allanson

posted on 12/4/04 at 08:51 PM Reply With Quote
I made it 22mm!!





If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation

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Markp

posted on 12/4/04 at 09:52 PM Reply With Quote
I think MK say 21mm, Thats what I made mine (well tried to)

Mark

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Mark Allanson

posted on 12/4/04 at 09:59 PM Reply With Quote
MK is for Sierra uprights, mine are Cortina





If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation

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JoelP

posted on 13/4/04 at 07:55 AM Reply With Quote
i was gonna say last night i was on about sierra hubs! mine are about 25 anyway, more the merrier unless the wheels fall off...






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jonti

posted on 13/4/04 at 05:08 PM Reply With Quote
Is there no castor offset to consider built into the Sierra hub then ?





OFROK

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JoelP

posted on 14/4/04 at 08:12 AM Reply With Quote
not sure about built in castor, but the hub axis is infront of the line between upper and lower pivots, this could be called anti-trail? i think....

this might explain why sierra hubs dont seem to like self-centering much.

any thoughts?






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