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Old 09-12-11, 04:41 PM   #1
motobecane69
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sti shifters and mtb cranks. what fd?

Having a brain fart on this. I've got sti shifters but want to run a 22/32/44 crank. Do I just slide my existing fd down the seat tube and experiment or do o need to buy a special part? Don't mtb fds have a different pull ratio?
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Old 09-12-11, 05:35 PM   #2
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Having a brain fart on this. I've got sti shifters but want to run a 22/32/44 crank. Do I just slide my existing fd down the seat tube and experiment or do o need to buy a special part? Don't mtb fds have a different pull ratio?
Yes, mountain bike front derailers have a different pull ratio. That means that you don't want to use a mountain bike front with STI shifters. They don't play all that nice together. Use a road front for the easiest setup.

Look here for all the information you need on adjusting the front derailer. The only information you should need is the front derailer height and alignment instructions. The limit screws shouldn't need resetting.
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Old 09-12-11, 06:04 PM   #3
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I was worried about the shaping of the deraileur cage, but ill just set it up and give it a whirl!
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Old 09-12-11, 06:07 PM   #4
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I run Ultegra 6600 Sti shifters with Tiagra front and a 26/39 Sram X7 Crankset. Works like a charm.
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Old 09-12-11, 07:16 PM   #5
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Left bar end shifter is not fussy about what FD it's attached to.

Brifters have just a big throw, one per chainring, no fine tuning.
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Old 09-12-11, 07:42 PM   #6
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Barends sux.

Last edited by Allen; 09-12-11 at 10:53 PM.
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Old 09-12-11, 08:15 PM   #7
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Except not.

If you can't get your existing road FD to play nicely with your brifters, the IRD alpina is designed for smaller rings and all that jazz, never tried it so I can't comment as to how well it actually works, but that is another possibly.
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Old 09-12-11, 08:32 PM   #8
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Except not.

If you can't get your existing road FD to play nicely with your brifters, the IRD alpina is designed for smaller rings and all that jazz, never tried it so I can't comment as to how well it actually works, but that is another possibly.
I can vouch.. I put an IRD Alpina triple on my Sirrus DBC and it works like a charm with my Sora brifters.
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Old 09-12-11, 08:35 PM   #9
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I'm using 10-speed Ultegra STI triple shifters with a 10-speed Ultegra triple FD to shift a Deore 9-speed 26/38/48 mountain/trekking crank.

Road bike cranks are designed for a 45mm chain line while mountain bike cranks typically use 50mm. The Deore crank and BB came with a bunch of spacers designed for a 50mm chain line. When I initially installed the crank and set it up per the instructions, the FD wouldn't shift to the largest chain ring. I removed one 2.5mm spacer from the drive side of the BB, which allowed the FD to shift to the large ring.

Unlike cyccommute, I did have to futz with the limit screws, in addition to changing the height of the FD. I think I might also have rotated the FD around the seat tube so that the rear of the cage was pointed slightly inward in an effort to improve shifts to the smallest ring. That's likely due to the fact that my Nashbar touring frame has a water bottle boss that prevents the FD from being at the optimal height.
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Old 09-12-11, 09:15 PM   #10
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I'm using 10-speed Ultegra STI triple shifters with a 10-speed Ultegra triple FD to shift a Deore 9-speed 26/38/48 mountain/trekking crank.

Road bike cranks are designed for a 45mm chain line while mountain bike cranks typically use 50mm. The Deore crank and BB came with a bunch of spacers designed for a 50mm chain line. When I initially installed the crank and set it up per the instructions, the FD wouldn't shift to the largest chain ring. I removed one 2.5mm spacer from the drive side of the BB, which allowed the FD to shift to the large ring.

Unlike cyccommute, I did have to futz with the limit screws, in addition to changing the height of the FD. I think I might also have rotated the FD around the seat tube so that the rear of the cage was pointed slightly inward in an effort to improve shifts to the smallest ring. That's likely due to the fact that my Nashbar touring frame has a water bottle boss that prevents the FD from being at the optimal height.
I'm actually probably using the the same deore crank as you just the 22/32/44 version of it. I'm familiar with the hollowtech cranks from my ultegra crank on my road bike so i know that all the bottom brackets are basically the same and they come with spacers if you need the MTB 73mm chainline. This is going on a nashbar touring bike but not the aluminum one which i know has that poorly positioned bottle bosses. this is for my new steel touring bike. I'm going to be running 2300 8 speed brifters and I have a few FD's to choose from. I will probably take the 105 fd off the bike and go with either the 8speed microshift or sora fd that i have kicking around. I was reading somewhere that I should use a 9speed chain and that it will work nice with 8 speed stuff. Here is my real issue. the bike has a 5700 series 105 RD on it. Will that work okay with an 8 speed chain? I already bought the new 8 speed chain and I'm hoping that the 8 speed cassette that came on a used set of wheels I bought isn't too beat up and will play nice with the new chain.
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Old 09-12-11, 09:56 PM   #11
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I was worried about the shaping of the deraileur cage, but ill just set it up and give it a whirl!
That's the best way to do it. Try it and see if it works. If it does, ride. If it doesn't work, find something that does.
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Old 09-12-11, 10:00 PM   #12
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I'm glad i stumbled on this thread, you have me thinking now that i've wasted my money buying a new XT front mech. I am running Tiagra triple levers, new XT cranks (22/32/44) and it's working fine with my Tiagra front mech. I just upgraded front and rear mechs to XT and they should be here this week but now i'm concerned if i'm going to have issues with it.
not the end of the world i guess as i can always put my Tiagra back on but will report back here either way. Oh and yes i have a 68mm BB shell and added the spacers as per the instructions with my XT crankset.
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Old 09-12-11, 10:12 PM   #13
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I can vouch.. I put an IRD Alpina triple on my Sirrus DBC and it works like a charm with my Sora brifters.
Another vote for the IRD Alpina-D.
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Old 09-13-11, 04:45 AM   #14
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I'm glad i stumbled on this thread, you have me thinking now that i've wasted my money buying a new XT front mech. I am running Tiagra triple levers, new XT cranks (22/32/44) and it's working fine with my Tiagra front mech. I just upgraded front and rear mechs to XT and they should be here this week but now i'm concerned if i'm going to have issues with it.
not the end of the world i guess as i can always put my Tiagra back on but will report back here either way. Oh and yes i have a 68mm BB shell and added the spacers as per the instructions with my XT crankset.
Whether or not you need to add the spacers probably has to do with what your running for a rear wheel. IT's not just a 68 vs 73mm bb shell issue but I think it's really more of a 130 vs 135mm in the rear issues because don't forget you've got to have the chainline matched up front and rear. Don't hold me to this, there are others more experienced that can tell you for sure.

With all that said, I don't even know what the rear spacing is on my nashbar steel frame touring rig, the rear hub sort of looks like a deore hub without a disc mount on it, I better take some measurements to be sure.
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Old 09-13-11, 08:16 AM   #15
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I'm glad i stumbled on this thread, you have me thinking now that i've wasted my money buying a new XT front mech. I am running Tiagra triple levers, new XT cranks (22/32/44) and it's working fine with my Tiagra front mech. I just upgraded front and rear mechs to XT and they should be here this week but now i'm concerned if i'm going to have issues with it.
not the end of the world i guess as i can always put my Tiagra back on but will report back here either way. Oh and yes i have a 68mm BB shell and added the spacers as per the instructions with my XT crankset.
do you have 2.5 mm spacers on each side or do you have both of them on the left side none on the right. Seems by my measurements that i have a 45.5mm chainline in the back which corresponds to a road triple. The bb that came with my used crank only has one spacer with it so the spindle is too long, I need to use another spacer, hopefully my lbs will have one kicking around. If i put a spacer on each side and push the front chainline out to 48 that means I should favor using small cogs in the back correct? That may not be so bad because i'll be using this for commuting a lot and with the MTB cranks I'll definately be using the smaller cogs a lot more than i do on my road bike.
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Old 09-13-11, 09:16 AM   #16
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FYI, one issue may be the length of the FD cage. I've test fitted everything and when I slid the 105 FD down i may not be able to get it low enough without the cage hitting the chainstay. A quick measurement shows me that the couple of 8speed FD's i have kicking around appear to be a little smaller so I may just go with them.
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Old 09-13-11, 10:56 AM   #17
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FYI, one issue may be the length of the FD cage. I've test fitted everything and when I slid the 105 FD down i may not be able to get it low enough without the cage hitting the chainstay.
Bingo. I had the same problem with an Ultegra triple FD and a 48T large ring.
The FD was so far above the large ring that middle->large shifts were nearly impossible.
I went to the IRD Alpina-D, and the cage was shorter, enabling me to put it right down to the chainring, giving me perfect shifting.
The Ultegra FD is now on the GF's bike where it works great with a 50T large ring.
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Old 09-14-11, 09:03 PM   #18
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Originally posted by Kayakdiver
I run Ultegra 6600 Sti shifters with Tiagra front and a 26/39 Sram X7 Crankset. Works like a charm.
+1 or 2 or 3

The Tiagra 4503 FD works well with a 22/32/44 crankset. No issues getting it low enough. It is a pretty versitile piece of equipment.


LHT


Last edited by Doug64; 09-16-11 at 08:41 PM.
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