Another day with wheels (and so on).
A customer left me a ZIPP 310 rim to work with.
From this era, there was a "340" version for 700C rims,
and the "310" is its 650C counterpart.
This is from the era when only the outer perimeter
(just below the brake zone) was filled with polyurethane foam.
There are no marks on the brake zone, and no evidence of tire mounting.
It appears to be unused.
When this rim was current production,
something like tubular tape didn't exist,
so if it had ever been used, there would be some trace of rim cement remaining.
The tire-seating surface has a tight radius,
and the intended tire width was probably around 19–21C.
A 23C can barely fit, but I'd advise against trying a 25C.
Built it. Just the front wheel for today.
The hub is the discontinued HB-CX75,
this hub only comes in 28H specification, so this is also 28H,
laced in reverse Italian (Italian 4-cross) with black half-comp spokes.
I'll do the spoke nipple wrapping later.
Old ZIPP rims have terrible braking power and
generate a lot of brake heat, so
it's a good idea to build them with a disc brake hub.
I used silver brass nipples.
ZIPP rims from this era have extremely high friction with the nipples,
and while I'm employing several methods to reduce it,
building with aluminum nipples would be extremely difficult.
A customer left me a ZIPP 310 rim to work with.
From this era, there was a "340" version for 700C rims,
and the "310" is its 650C counterpart.
This is from the era when only the outer perimeter
(just below the brake zone) was filled with polyurethane foam.
There are no marks on the brake zone, and no evidence of tire mounting.
It appears to be unused.
When this rim was current production,
something like tubular tape didn't exist,
so if it had ever been used, there would be some trace of rim cement remaining.
The tire-seating surface has a tight radius,
and the intended tire width was probably around 19–21C.
A 23C can barely fit, but I'd advise against trying a 25C.
Built it. Just the front wheel for today.
The hub is the discontinued HB-CX75,
this hub only comes in 28H specification, so this is also 28H,
laced in reverse Italian (Italian 4-cross) with black half-comp spokes.
I'll do the spoke nipple wrapping later.
Old ZIPP rims have terrible braking power and
generate a lot of brake heat, so
it's a good idea to build them with a disc brake hub.
I used silver brass nipples.
ZIPP rims from this era have extremely high friction with the nipples,
and while I'm employing several methods to reduce it,
building with aluminum nipples would be extremely difficult.