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Search: Posts Made By: FrankCerny
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Forum: Classic & Vintage
11-18-21, 12:05 PM
Replies: 17
Views: 1,056
Posted By T-Mar

They go back farther than that. Shimano's AT...

They go back farther than that. Shimano's AT (Aternate Tooth) freewheels are in the 1972 catalogue and shown in 1971, Japanese market, advertisements. It wouldn't surprise me if they even pre-date...
Forum: Classic & Vintage
11-18-21, 09:37 AM
Replies: 17
Views: 1,056
Posted By JohnDThompson

The "skip tooth" large sprockets were to...

The "skip tooth" large sprockets were to facilitate shifting onto those sprockets. Later "Uniglide" and still later "Hyperglide" tooth profiles were found to work better and can be done to improve...
Forum: Classic & Vintage
11-18-21, 06:48 AM
Replies: 17
Views: 1,056
Posted By pastorbobnlnh

FWIIW, this is the first time I remember seeing...

FWIIW, this is the first time I remember seeing the 4th sprocket with both skip and normal teeth on the same sprocket. Maybe I was just not paying attention in the past, but I doubt it. When I...
Forum: Classic & Vintage
11-18-21, 05:57 AM
Replies: 17
Views: 1,056
Posted By verktyg

Shimano 14-34T Freewheels

That's a Shimano Wide Ratio 5 Speed 14-34T freewheel with Alternate Teeth (Skip Tooth) on the two largest sprockets. They were made in 14-17-22-28-34T with or without the skip tooth feature on the...
Forum: Classic & Vintage
11-18-21, 04:54 AM
Replies: 17
Views: 1,056
Posted By oneclick

Weight-saving and shifting. A larger sprocket can...

Weight-saving and shifting. A larger sprocket can have some teeth missing and still have enough to engage the chain and carry the load, and the chain can be pulled sideways onto and off the sprocket...
Forum: Classic & Vintage
11-17-21, 11:54 PM
Replies: 17
Views: 1,056
Posted By canklecat

That wasn't unusual on 5-speed consumer grade and...

That wasn't unusual on 5-speed consumer grade and touring bikes then. Combining larger cogs with only 5, 6 or 7 cogs will require at least one or two awkward steps between cogs.

This previous...
Showing results 1 to 6 of 6


 
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