On Jun 11, 11:53Â am, fiddler crabby
ya-nospam-hoo.com>
wrote:>> On Jun 9, 12:52=A0pm, fiddler crabby
ya-nospam-hoo.com>
>> wrote:>>> I've got a late-70s 10 speed that I'm considering converting to either
>>> fixed or single gear. Anyone here have any experience building one? Are
>>> there local shops that stock parts at a good price (I'm thinking about a
>>> flip-flop hub)? =A0
>
>> Another option, upgrade the rear cogset and chain to hyperglide, which
>> will vastly improve the shifting. Yes, it's fully compatible with all
>> the old kit:
>
>
>> If your old rear derailleur's bushings are worn, replace it with
>> something less crappy--just about anything will do.
>
> How's hyperglide different from the original setup?
>
Quick nerdy bike chain cog lesson:
back until the mid 80s, cogs were all flat and ya shifted by feel and
noise--the Italian stuff liked to be "overshifted " to pop onto the
next cog. The mid 80s brought "Uniglide" cogs from Shimano which had
every few cogs having a twisted shape which helped chain pickup quite
a bit. By the time 7-8 speed rolled around we went "Hyperglide" which
is a huge step forward because as Sheldon Brown explains, "it's system
of ramps and special-shaped teeth on Shimano rear sprockets that
permits much smoother shifting than older systems. HG sprockets are
designed so that, as the chain moves from one sprocket to the next, it
will engage the new sprocket before it has completely derailed from
the old one. This makes for smooth, silent shifting."
Basically, even without clicky indexing--if you use old friction
shifters with modern rear Hyperglide style cogs--which are available
as I linked to for old style bikes--you get a really positive feeling
shift. It pops into place because of the little ramps instead of going
kkkklunk.
In my opinion if you're gonna ride a geared road bike that's vintag
--
running modern cogs with vintage shifters is the bomb--6-7 speed stuff
is really easy to shift via friction, not too fussy at all. It's a
stupid cheap upgrade to boot. Under $50 usually for freewheel and
chain--and you're suddenly shifting better than any bike that existed
at the time yours was built.
