D
Doug Goncz
Guest
Wouldn't it be great if you could backpedal your multigear
bike and get braking that would ease the front brake the
instant the rear tire started to lift?
I built such a bike in about 1992.
It was a Shimano three speed coaster brake hub, on the
cheapest frame I could get, salvaged from the cleanout of
the Hollybrooke condominium bicycle storage room.
The torque arm was supported by about a 10 x 25 mm cartridge
bearing which in turn was spaced by a shim made from a
polyethylene milk jug cap, the kind that you have to tear
the tab off of to open. The rearranged axle lock nuts
applied force from the outside through the now mobilized arm
to the large (50mm) bearing of tiny (individual?) balls that
was the left hub cup and cone. The cartridge bearing was
therefore used at extrememly _low_ PV in its designed
function, and at high P, zero V in its thrust ability. Such
bearings do have thrust ability.
The braking action was overly responsive in first, about
right in second, and had a strange behavior in third. I'd
say third on that bike was for no-traffic, no-hill
conditions only, but I did ride it 14 miles from Greenwood
Drive to Pickett Rd. to the bike shop and it did work, and I
didn't have any accidents. You could instantly snap the
shifter to any brake geometry you'd care so all in all it
was fairly safe.
Well, now I am building the wide range Thunderbolt and I
would like to get rid of this one of about 120 boxes I have
lying around. If you'd like to have a go, all the parts
needed are in the box. Sorry, the frame is long gone. No
spokes. No rims. Just the magic hub, fittings, cabling, and
caliper brake, a good one if I remember correctly.
I'd mount the shifter on the seat post and leave the
handlebars gloriously bare, but your taste is not my taste.
My physics project at NVCC: Google Groups, then
"dgoncz" and some of: ultracapacitor bicycle
fluorescent flywheel inverter
4-1-9 Fraud
http://www.secretservice.gov/electronic_evidence.shtml
bike and get braking that would ease the front brake the
instant the rear tire started to lift?
I built such a bike in about 1992.
It was a Shimano three speed coaster brake hub, on the
cheapest frame I could get, salvaged from the cleanout of
the Hollybrooke condominium bicycle storage room.
The torque arm was supported by about a 10 x 25 mm cartridge
bearing which in turn was spaced by a shim made from a
polyethylene milk jug cap, the kind that you have to tear
the tab off of to open. The rearranged axle lock nuts
applied force from the outside through the now mobilized arm
to the large (50mm) bearing of tiny (individual?) balls that
was the left hub cup and cone. The cartridge bearing was
therefore used at extrememly _low_ PV in its designed
function, and at high P, zero V in its thrust ability. Such
bearings do have thrust ability.
The braking action was overly responsive in first, about
right in second, and had a strange behavior in third. I'd
say third on that bike was for no-traffic, no-hill
conditions only, but I did ride it 14 miles from Greenwood
Drive to Pickett Rd. to the bike shop and it did work, and I
didn't have any accidents. You could instantly snap the
shifter to any brake geometry you'd care so all in all it
was fairly safe.
Well, now I am building the wide range Thunderbolt and I
would like to get rid of this one of about 120 boxes I have
lying around. If you'd like to have a go, all the parts
needed are in the box. Sorry, the frame is long gone. No
spokes. No rims. Just the magic hub, fittings, cabling, and
caliper brake, a good one if I remember correctly.
I'd mount the shifter on the seat post and leave the
handlebars gloriously bare, but your taste is not my taste.
My physics project at NVCC: Google Groups, then
"dgoncz" and some of: ultracapacitor bicycle
fluorescent flywheel inverter
4-1-9 Fraud
http://www.secretservice.gov/electronic_evidence.shtml