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What is an upgrade from the Shimano C101 front Derailleur?

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What is an upgrade from the Shimano C101 front Derailleur?

Old 01-21-18, 11:39 PM
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What is an upgrade from the Shimano C101 front Derailleur?

This is for a Trek Mutlitrek 7500.

There are 3 front chainrings

The shifters are ST-EF51.

I have a rear 8 shifter.
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Old 01-21-18, 11:56 PM
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Have a look at the derailleur specs to see what's similar to what you have.

https://productinfo.shimano.com/#/spe...t%20Derailleur

https://productinfo.shimano.com/#/spe...t%20Derailleur

Last edited by cobba; 01-22-18 at 12:05 AM.
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Old 01-23-18, 09:08 PM
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Originally Posted by cobba
Have a look at the derailleur specs to see what's similar to what you have.

2017-2018 SHIMANO Product Information Web

2017-2018 SHIMANO Product Information Web
Thanks,

The front crankset is 28/38/48 teeth and the rear is an 8 speed. I'm looking thru the diagrams. It seems I should pick a FD based on my rear speed? How do I match up the teeth?
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Old 01-23-18, 09:35 PM
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What might be an "upgrade" depends on what you feel is deficient about your current derailleur.
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Old 01-23-18, 10:23 PM
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IF your current FDER is damaged, I'd just get an Altus. That's a slight upgrade from the C-101 Tourney, which still should work fine for your application..
"Upgrading too much" means more speeds, which requires narrower chains and thus FDER's.
That can introduce chain rub problems that didn't exist before.

A C-101 should work well if properly adjusted. Assuming it's not worn out or damaged.

FDER's will come in 2 "sizes" for your bike. Ones designed for cranks with rings sized about 22-32-44 & and one sized for the rings you currently have. You don't want the wrong one.

What is the purpose of the "upgrade"?
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Old 01-24-18, 06:37 AM
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I remember hating those c-101 derailleurs for some reason, but I don't remember what the issue was. If it was my bike, I think that I'd plug in an Altus like Bill Kapaun suggested.
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Old 01-24-18, 09:48 AM
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Originally Posted by Bill Kapaun
IF your current FDER is damaged, I'd just get an Altus. That's a slight upgrade from the C-101 Tourney, which still should work fine for your application..
"Upgrading too much" means more speeds, which requires narrower chains and thus FDER's.
That can introduce chain rub problems that didn't exist before.

A C-101 should work well if properly adjusted. Assuming it's not worn out or damaged.

FDER's will come in 2 "sizes" for your bike. Ones designed for cranks with rings sized about 22-32-44 & and one sized for the rings you currently have. You don't want the wrong one.

What is the purpose of the "upgrade"?
I honestly pitched the FD because it was corroded, I wish I didn't because everyone afterwards was telling me that FDs can be rusted to hell and still operate properly. It was surprisingly movable even though it had some rust on it. Anyway I can't find the C101 on ebay anymore, the other that they have is an E type and I really don't like to buy used anything.

If I get an Altus it appears from reading the PDF that the one's compatible are.

Altus FD-M313-3 = 42/48T
Altus FD-M313-6 = 42/48T
Altus FD-M310-3 = 42/48T
Altus FD-M310-6 = 42/48T
Toureny TX FD-TX800-TS3 = 42/48T
Tourney TX FD-TX800-TS6 = 42/48T

Those were all form the first PDF, none from the 2n PDF link. Now I notice each have different chain stay angles? I see there are cosmetic differences. But how are the Tourney diff from the Altus? Seems just minute differences, not sure...
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