Dan Musicant said:The wheels that came with my Miyata One-Twelve are Sansin and the local shops tell me they can't
find replacement cones so I'm looking forward to modifying my bike to accept 700c wheels. I
realize that there's a much better variety of tires available in 700c, too.
The front should accept 700c with no modifications, it appears, because I can readily drop the
(admittedly poor type) brake pads down the 1/4 inch or so required. However, the back brake pads
may not extend low enough. I believe I can probably work the parts with a rat-tail file perhaps
1/16 inch to work around that limitation.
Assuming this bike uses the older type of brake attachment with an external nut (10 mm wrench size)
the best place to use the rodent extremity is to re-shape the hole in the frame's brake bridge a bit
so that you can pivot the caliper downward a skosh.
Quoted message said:I found a couple of 700c wheels that look very nice, one front and one back. The cones look fine
and the rims and spokes are great. In fact the spokes appear to be stainless steel. I'm really
impressed.
The rear 700c wheel, however, has a 7 sprocket freewheel, whereas my Miyata was furnished with a 6
sprocket Shimano and Shimano index shifting and derailer components. Can I use this 700c wheel?
Can I use it with it's present freewheel? It looks very different from the 6 sprocket and 5
sprocket freewheels I've seen. There is a lot of variation in the way the teeth were machined. I
have to think that the tooth system was computer generated and designed somehow. It says this:
Shimano Interactive Glide 2 Japan Lock > 40N.m
That's not a freewheel, that's a cassette Freehub, the very much superior modern system that has
made the old thread-on freewheels obsolete.
See: sheldonbrown.comfree k7.htmlOpen ↗
The different shaped teeth are indeed computer generated, a feature known as "Hyperglide" and it
yields a drastic improvement in shifting smoothness.
See: sheldonbrown.comk7.htmlOpen ↗
This cassette won't index properly with your 6-speed shifters, but you can probably switch the
shifter to friction mode.
The better solution would be to replace your shifter with a 7-speed unit of some sort.
See: sheldonbrown.comderailers.htmlOpen ↗
Note, you should also replace the chain when you switch to the new rear wheel. I particularly
recommend SRAM chains for this application, either the PC48 or PC58.
Sheldon "Upgrades" Brown +----------------------------------------------------------------------+
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