road triple FD - MTB triple crankset?
01-14-11, 03:24 PM
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road triple FD - MTB triple crankset?
OK, this may be a very elementary thing, but will my Shimano 9 speed triple road front derailleur (6503) work with a MTB 9 speed triple crankset?
Specifically, will it work with either or both of the common options: 44/32/22 OR 48/36/26? I prefer the larger (48t) option.
I know, try it, but I'm looking for a cross frame to build up as an all around rough trail/road and for my commuter (no cross racing or loaded touring). I have a complete 6503 group and also have a MTB crankset and BB. I've been hung up trying to find a cross frame that will accommodate my 52-42-30 road triple (which gives me fine gearing for what I need). Many/most cross frames have a 48t large chainring limit which has been a major road block for me.
Today, I (DUH) ran the numbers on Sheldon Brown's gear calculator and (DUH again) found that the 52X12 is very close to equivalent to a 48X 11. So I really don't need to get hung up on that factor.
As a related question, if I had to go with a MTB FD, would it work with my STI shifters?
THANKS!
Specifically, will it work with either or both of the common options: 44/32/22 OR 48/36/26? I prefer the larger (48t) option.
I know, try it, but I'm looking for a cross frame to build up as an all around rough trail/road and for my commuter (no cross racing or loaded touring). I have a complete 6503 group and also have a MTB crankset and BB. I've been hung up trying to find a cross frame that will accommodate my 52-42-30 road triple (which gives me fine gearing for what I need). Many/most cross frames have a 48t large chainring limit which has been a major road block for me.
Today, I (DUH) ran the numbers on Sheldon Brown's gear calculator and (DUH again) found that the 52X12 is very close to equivalent to a 48X 11. So I really don't need to get hung up on that factor.
As a related question, if I had to go with a MTB FD, would it work with my STI shifters?
THANKS!
01-14-11, 03:44 PM
#2
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48t falls in the middle , there are Trekking bike parts for their common 48,36,26 combinations, Euro Market.
the arc of the outside face of the front derailleur is different for the 44 and for the 53t types ,
try what you have 1st.
Many people say they find Road STI throws the chain not quite the right distance, mixing with mountain bike gearing .
I have an old MTB with somewhat upgraded Deore derailleurs,
but that's far from what's sold now ,
that FD was made for 48t big rings .. years ago.
Operated by bar end shifters, in My case.
the arc of the outside face of the front derailleur is different for the 44 and for the 53t types ,
try what you have 1st.
if I had to go with a MTB FD, would it work with my STI shifters?
I have an old MTB with somewhat upgraded Deore derailleurs,
but that's far from what's sold now ,
that FD was made for 48t big rings .. years ago.
Operated by bar end shifters, in My case.
Last edited by fietsbob; 01-15-11 at 01:28 PM.
01-14-11, 03:56 PM
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IRD/Soma Alpina-d Compact Road Triple Front Derailer
This is the only current front derailer that is designed to work with both:
•Mid-sized triple crankset (46-48 tooth big ring)
and
•Shimano drop handlebar ("road") STI front shifters
Available for 3 different sized seatposts with clamp mount, and for braze-on mount.
All variations use the same basic braze-on derailer. Clamp on versions come with an appropriate clamp adaptor installed.
https://harriscyclery.net/product/ird...ailer-2435.htm
This is the only current front derailer that is designed to work with both:
•Mid-sized triple crankset (46-48 tooth big ring)
and
•Shimano drop handlebar ("road") STI front shifters
Available for 3 different sized seatposts with clamp mount, and for braze-on mount.
All variations use the same basic braze-on derailer. Clamp on versions come with an appropriate clamp adaptor installed.
https://harriscyclery.net/product/ird...ailer-2435.htm
Last edited by Barrettscv; 01-15-11 at 08:52 AM.
01-14-11, 04:22 PM
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OK, this may be a very elementary thing, but will my Shimano 9 speed triple road front derailleur (6503) work with a MTB 9 speed triple crankset?
Specifically, will it work with either or both of the common options: 44/32/22 OR 48/36/26? I prefer the larger (48t) option.
I know, try it, but I'm looking for a cross frame to build up as an all around rough trail/road and for my commuter (no cross racing or loaded touring). I have a complete 6503 group and also have a MTB crankset and BB. I've been hung up trying to find a cross frame that will accommodate my 52-42-30 road triple (which gives me fine gearing for what I need). Many/most cross frames have a 48t large chainring limit which has been a major road block for me.
Today, I (DUH) ran the numbers on Sheldon Brown's gear calculator and (DUH again) found that the 52X12 is very close to equivalent to a 48X 11. So I really don't need to get hung up on that factor.
As a related question, if I had to go with a MTB FD, would it work with my STI shifters?
THANKS!
Specifically, will it work with either or both of the common options: 44/32/22 OR 48/36/26? I prefer the larger (48t) option.
I know, try it, but I'm looking for a cross frame to build up as an all around rough trail/road and for my commuter (no cross racing or loaded touring). I have a complete 6503 group and also have a MTB crankset and BB. I've been hung up trying to find a cross frame that will accommodate my 52-42-30 road triple (which gives me fine gearing for what I need). Many/most cross frames have a 48t large chainring limit which has been a major road block for me.
Today, I (DUH) ran the numbers on Sheldon Brown's gear calculator and (DUH again) found that the 52X12 is very close to equivalent to a 48X 11. So I really don't need to get hung up on that factor.
As a related question, if I had to go with a MTB FD, would it work with my STI shifters?
THANKS!
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Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
01-14-11, 04:23 PM
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I'm using an Ultegra triple FD with a Sugino 48/38/26 crank and it works quite well.
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01-15-11, 08:50 AM
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Triple road derailleur and mountain crank (even 44T) is fine. Even a double FD will work, but the low to middle front shift will be slow.
STI shifters won't work with a MTB derailleur unless you're willing to only use two chainrings. But it's generally not worth the fiddling since a road FD works fine.
STI shifters won't work with a MTB derailleur unless you're willing to only use two chainrings. But it's generally not worth the fiddling since a road FD works fine.
01-17-12, 03:10 PM
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What about chainline. I know with shimano there is 45(road) and 50(mtn) expected chainline. So does mixing a Roadd Fder and mnt crank screw up that alignment by shifting the crank to far out for the der.
Eric
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01-18-12, 02:53 AM
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Chainline would also be my main concern here. You'll need a road FD so that it will work well with your road shifter, but the road FD may not swing far enough out from the frame to get to the big ring. This is because the big ring is spaced a lot further out on a MTB crank than on a road crank (in order to clear the wider chainstays on MTBs, which are wider in order to clear the fat tires). If it was a 3-piece crankset, you could just choose the appropriate bottom bracket length, but if it is a modern integrated axle design then there is no way to reduce the chainline.
Hopefully the road FD does have the lateral range to get to the big ring OK. But if not then there are tandem-specific braze-on FD mount adaptors that you can put on round seatposts and place the braze-on mount point further from the frame. Road tandems have a wider chainline than single bikes (this time to match the widely-spaced rear hub, which is needed due to the added weight it bears), so it might provide a possible solution.
OK, I'll stop rambling now.
Hopefully the road FD does have the lateral range to get to the big ring OK. But if not then there are tandem-specific braze-on FD mount adaptors that you can put on round seatposts and place the braze-on mount point further from the frame. Road tandems have a wider chainline than single bikes (this time to match the widely-spaced rear hub, which is needed due to the added weight it bears), so it might provide a possible solution.
OK, I'll stop rambling now.
01-18-12, 11:21 AM
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