Hallo folks ! I want fit shimano 105 triple front derailleur with a mtb triple crankset (22/32/44 or 26/36/48 teeth) who can help me ? Thanks in advance
Thank Koyote I want pairing a 105 front triple derailleur with a mtb crankset. Now my problem is the flat profile of the biggest gear and the 105 derailleur isn’t able to go up the chain. My idea is change the crankset with an update type (the one fitted is worn) Which one is good for me ?
Sorry drwelby my problem is the crankset. I have a new 105 triple shifter (ST-5703)+ new 105 trilple derailleur (FD-5703) and an old MTB XTR crankset (FC-M900). The simplest solution is buy a 105 triple crankset (FC-5703) but I prefer have a MTB crankset (22/32/44 gear). What is the MTB crankset who fit right ? The bike is an old MTB (1991 KHS) switched in Gravel
any new shimano mtb triple crankset should work, if it's a 68mm BB you'll just need to use two 2.5mm spacers (one drive side, one non-drive side) to make up the difference in spindle length
Hmmmmm... You might be running into the problem of the FD not having enough range???
The road derailleurs are designed around a 68mm BB width. The two 2.5mm spacers Clarksonxc mentioned above are intended to space a road BB for a MTB crankset.
Your bike, being an old school MTB, should already have a 73mm BB width so a road bottom bracket isn't going to fit. From the picture it appears you are using the original or same vintage cranks.
So first thing: Check to see if the FD has sufficient throw (range) to even push the chain onto the big ring. One check is to move the chain into the large chainring and small cassette cog and see if the FD rubs the chain. If the FD cannot move far enough to the right to eliminate the chain rub then you're going to need to do a hack (kludge?).
If the FD can move the chain far enough over that it isn't rubbing then you should be able to make it work. To give a better reply I'd need some more close up pic's of the FD (side, above, behind).
General guidelines which usually help with FD setup - Adjust FD cage to clear the chainring by 1 to 2 mm (read: really really close) - Outside (right) plate of FD cage should be parallel to the large chainring.
Other concerns and potential issues: The crankset 10 speed chainrings are spaced nearer to each other than the vintage 6/7/8 speed chainrings. This means the FD and shifter will be designed (tuned) to throw a shorter distance when moving between the 3 rings.
If you can find a 9 speed triple it'll be spaced closer to a 10 speed. An 11 speed would match, but I don't know of anybody making 11 speed triples.
I believe the FD is spec'd for a maximum of 20t from the large to small chainring so a 22-32-44 crankset will be pushing the limit. Shimano's road triples are more like: 50/39/30
Here are some other ideas so search on: 48/38/28 48/38/26 cranksets are available - BUT you need to find a mtb version with 73mm BB - OR you need to find a crankset that is 3-piece so you can select the appropriate width BB. This was more common with 9-speed and earlier cranks.
Also be careful that very few "square taper" cranksets are spaced for 10 speed. This can be a problem if one is using a 10 speed chain and shifting under load.
