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What's an E-type FD

Old 03-21-07, 05:59 AM
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What's an E-type FD

Looking at new mtn./trekking cranks and like the Shimano LX M581 (48-36-26T) crank, but am confused about the product listing when it specifies an "E-type" front derailleur. And since it is an integrated crankset, it doesn't give a spindle length. Does E-type mean that I'll need an extended range derailleur or something like that? I was planning on using a LX-571 BS BP FD (building up a Monkey and have to be concerned with tire clearance issues). Thanks.
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Old 03-21-07, 06:14 AM
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e-type front derailleurs don't mount at the seat tube, they're installed against an e-type bottom bracket. It used to be that they were pretty much exclusive to cheaper bikes, I think, but with some full suspension mountain bikes not having conventional seat tubes, they're necessary on these bikes as well-
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Old 03-21-07, 07:20 AM
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Thanks well biked.

So I assume that the crank is compatible with, but does not require an "E-type" FD?
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Old 03-21-07, 08:36 AM
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Originally Posted by LBIkid
Thanks well biked.

So I assume that the crank is compatible with, but does not require an "E-type" FD?
Yes, but I don't believe you need to be concerned with an E-type front derailleur on that frame. I know it has a curved seat tube, but I don't think that will interfere with a clamp-on FD (according to the Surly website it takes a 28.6mm clamp size FD). For the LX cranks with a 48t big ring, get the M581 FD that's meant for a 48t big ring (you have to specify that because there's more than one model of M581 FD). The derailleur comes with shims to fit most any seat tube diameter.

Advantages of E-type front derailleurs: speedy and foolproof assembly (think cheap bikes), there's no up/down adjustment, just slap it on and you're done. Also, it allows use of a FD on bikes with unconventional seat tubes where it wouldn't be possible to mount a clamp-style front derailleur.

Disadvantages: they're heavier (particularly the older ones), and they have no up/down adjustment if you want to change the size of your chainrings-
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Old 03-21-07, 10:17 AM
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Shimano has done and still does etype derailleurs all the way up to XTR.
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Old 03-21-07, 10:28 AM
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Originally Posted by mtnbiker4791
Shimano has done and still does etype derailleurs all the way up to XTR.
Right, intended for frames not compatible with clamp-on FD's, as I said. Unless there's another reason you'd want an e-type that I'm not aware of-
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Old 03-21-07, 12:13 PM
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I appreciate the help.

I DO NOT want an E-type derailleur. I want a trekking crank with a 48T large chain ring. I was thrown off by the item description that said "compatible with E-type derailleurs". As I gather from this thread, the crank is comaptible with, but does not require an E-type derailleur.

Now I have to worry whether:
1. A 48T chain ring will be compatible with my existing LX M571 BP BS front derailleur and
2. If I need to get another FD, will the M581 still work on the Karate Monkey (there are very specific tire clearance issues with using a newer dual pull FD with a geard Karate Monkey frame).

Seems I may be stuck with the standard 44T crankset.
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Old 04-25-23, 06:49 PM
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Originally Posted by LBIkid
I appreciate the help.

I DO NOT want an E-type derailleur. I want a trekking crank with a 48T large chain ring. I was thrown off by the item description that said "compatible with E-type derailleurs". As I gather from this thread, the crank is comaptible with, but does not require an E-type derailleur.

Now I have to worry whether:
1. A 48T chain ring will be compatible with my existing LX M571 BP BS front derailleur and
2. If I need to get another FD, will the M581 still work on the Karate Monkey (there are very specific tire clearance issues with using a newer dual pull FD with a geard Karate Monkey frame).

Seems I may be stuck with the standard 44T crankset.
Probably not. The Shimano "Lifestyle (Trekking)" page has specs for current equipment. 48t is common in this category. https://bike.shimano.com/en-US/compo...lifestyle.html
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Old 04-25-23, 07:16 PM
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Old 04-27-23, 06:18 AM
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Originally Posted by shelbyfv
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