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But it's quite unusual right? Never seen it before.
spreading wear over twice as much chain provides longer intervals between replacement
Hopefully at least twice as long, since you need to buy an extra chain with this configuration.
Tijs-
But it's quite unusual right? Never seen it before.
Have you been looking? They have been a thing for at least 80 years 🙂
Hopefully at least twice as long, since you need to buy an extra chain with this configuration.
Exactly twice as long, assuming the chain is exactly twice as long. It's a saving in labour, not materials. The smaller skew angle might give a slight increase in chairing and cassette life, but I doubt that it's noticeable.
gbj_tester
The longer chain provides smoother running especially when cross-chained, spreading wear over twice as much chain provides longer intervals between replacement, the shorter front dérailleur cable keeps the front shifting in adjustment for longer, having the FD right under the person controlling it gives better feedback for shifting and trimming.