Front Derailleur Esoteric Quest
01-24-21 | 09:55 PM
#51
(rhymes with spook)
Joined: Aug 2009
Posts: 2,786
Likes: 749
From: Winslow, AR
Bikes: '83 univega gran turismo x2, '85 schwinn super le tour,'89 miyata triple cross, '91 GT tequesta, '90 yokota grizzly peak, '94 GT backwoods, '95'ish scott tampico, '98 bonty privateer, '93 mongoose crossway 625, '98 parkpre ariel, 2k'ish giant fcr3
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
01-24-21 | 11:22 PM
#52
Senior Member
Joined: Dec 2019
Posts: 2,841
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From: South Shore of Long Island
Bikes: 2010 Carrera Volans, 2015 C-Dale Trail 2sl, 2017 Raleigh Rush Hour, 2017 Blue Proseccio, 1992 Giant Perigee, 80s Gitane Rallye Tandem
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.
01-25-21 | 11:00 PM
#54
Highly Enriched Driftium
Joined: Apr 2017
Posts: 6,944
Likes: 2,266
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.
01-26-21 | 06:37 AM
#55
Thread Starter
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Joined: Oct 2004
Posts: 18,487
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From: Hardy, VA
Bikes: Mostly English - predominantly Raleighs
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.
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.
- Because I feel like it.
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