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Late 70ís Eisentraut, question about Shimano Crane rear derailleur

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Late 70ís Eisentraut, question about Shimano Crane rear derailleur

Old 01-01-21, 12:46 AM
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rlpfromak
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Late 70ís Eisentraut, question about Shimano Crane rear derailleur

Iíve got old bike with a Eisentraut A frame and a variety of Campy, Dura Ace, and Crane components. I bought it in 1976 and recently overhauled it, as it had sat unridden for many years. I kept most of the original components, including a Shimano Crane rear derailleur (the pedals are Campy and the crank is Dura Ace). Iíd like to use it with a direct drive smart trainer, something like a Tacx Flux S, but Iím worried that the derailleur wonít work for the larger cassettes now present on bikes (you have to buy a cassette for the Flux S). The largest gear on my current freewheel (not a cassette) has only 26 teeth. Does anybody know how large a cassette this derailleur will support?

(My other option is to buy a less expensive and lower quality wheel-on Trainer like the Flow)
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Old 01-01-21, 01:07 AM
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Originally Posted by rlpfromak View Post
I’ve got old bike with a Eisentraut A frame and a variety of Campy, Dura Ace, and Crane components. I bought it in 1976 and recently overhauled it, as it had sat unridden for many years. I kept most of the original components, including a Shimano Crane rear derailleur (the pedals are Campy and the crank is Dura Ace). I’d like to use it with a direct drive smart trainer, something like a Tacx Flux S, but I’m worried that the derailleur won’t work for the larger cassettes now present on bikes (you have to buy a cassette for the Flux S). The largest gear on my current freewheel (not a cassette) has only 26 teeth. Does anybody know how large a cassette this derailleur will support?
28t.

But before you go ordering a cassette, that's not the only problem here: you'd need to buy a new chain and install new chainrings at the very least to use to use that trainer's stock cassette since it's 11sp. The cheapest and much easier solution would be to install an 8-sp cassette with a 25-28t large gear and spacer on that trainer, that way you can leave the rest of your bike alone.
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Old 01-01-21, 08:35 AM
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You didn't mention if you Crane is short cage or long cage. That makes a difference.
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Old 01-01-21, 07:00 PM
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Thanks for the reply. The chain and the front chainrings are new, or at least almost new, with very few miles on them, so Iím hoping they are okay.. The current freewheel has just five gears and I was also worried if the width between the rear dropouts is wide enough. An 8-speed cassette does make more sense then
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Old 01-01-21, 07:01 PM
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And the Crane is short cage.
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Old 01-01-21, 07:15 PM
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Originally Posted by rlpfromak View Post
And the Crane is short cage.
A long cage of most any sort would expand the range you should be able to use, not that you would need it on the trainer.

I would encourage you to get a more suitable trainer bike and revive the Eisentraut to good stead.
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