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Front Derailleur Esoteric Quest

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Front Derailleur Esoteric Quest

Old 01-24-21, 09:55 PM
  #51  
thook
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mtb's have higher bottom bracket, so it's easy for a longer cage to clear the stay when/if using smaller rings on them
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Old 01-24-21, 11:22 PM
  #52  
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I did check the Tiagra a lot more tonight and I think I might have to cancel my order for the derailleurs, they might not work at all. The 4700 tiagra der I do have, like several other random, more modern ders, has an offset to the front and rear plates that would not allow plates to be screwed together at an alternate location like an older style might. However the plates, in part due to thickness and in part due to shaping are incredibly stiff compared to a number of older ders that I have. Makes me wonder if just cutting and shaping wouldn't have enough stiffness. The back plate has two widely spaced connection points plenty of shaping to make it stiff for pushing and the front plate is pulling where it is strongest. I'd suspect the upshift would be where it might have the most trouble and if Gavenelle doesn't come up with more shifters I might have to test out the new disc sander and the grinder and find out just how stiff the der is without the sides connected.
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Old 01-25-21, 12:38 AM
  #53  
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Originally Posted by Russ Roth View Post
Makes me wonder if just cutting and shaping wouldn't have enough stiffness.
Works fine for me. (36t big ring) I'm using mtb rings so they have aggressive ramps.

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Old 01-25-21, 11:00 PM
  #54  
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Originally Posted by John E View Post
3 front * 7 cogs * 3 IGH, I presume? Cool! This reminds me of Charlie Harding's 90-speed bike, on display in his Westwood (Los Angeles) shop in the 1970s. I think he went 3x6 derailleur gears with a 5-speed IGH.
That's 63. I'm guessing 3 front x 9 rear x 3 IHG = 81 = no reason for it on that bike.

Reasons for an IHG with cogs:
- No front derailleur so can use a chainguard.
- Needs a tall overdrive because of tiny wheels, like a Brompton.
- Needs an ultra-low granny because pedaling a recumbent towing a heavy trailer up hills.
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Old 01-26-21, 06:37 AM
  #55  
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Originally Posted by Duragrouch View Post
That's 63. I'm guessing 3 front x 9 rear x 3 IHG = 81 = no reason for it on that bike.

Reasons for an IHG with cogs:
- No front derailleur so can use a chainguard.
- Needs a tall overdrive because of tiny wheels, like a Brompton.
- Needs an ultra-low granny because pedaling a recumbent towing a heavy trailer up hills.
You left out:
- Because I feel like it.
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