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Old 11-12-10, 09:58 AM   #1
drisin80
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shimano 105 9 speed triple crank on deore xt 8 speed drivetrain---???

Hi --- first post on this forum. I have a hybrid/touring marin which has all deore xt 8 speed components. I was wondering if I could replace the crankset which has a 44 tooth outer ring, with a 105 triple crankset (52 tooth outer) intended for 9 speed without too many problems????? thanks---tom
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Old 11-12-10, 10:16 AM   #2
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Tom, The XT was also available with a 48T chainring which may also suit you. You may also need to change the FD to have a cage that matches the 105 road crank.

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Old 11-12-10, 10:51 AM   #3
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If you change the front mech to a road unit, it may not index correctly because of the different cable pull ratios.
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Old 11-12-10, 11:18 AM   #4
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Originally Posted by MileHighMark View Post
If you change the front mech to a road unit, it may not index correctly because of the different cable pull ratios.
+1
If you really think you need a larger chainring the 48t recommendation by bradtx is the best bet.
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Old 11-14-10, 12:23 PM   #5
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Another problem you might have is if the bike you want to change has top tube cable routing. Road bike front deraileurs are only bottom pull so the cable runs under the bottom bracket and not from the top tube., Also Sram makes a cassette with an 11 tooth high gear cog in 8 or 9 speed. I think Shimano only goes to 12 tooth till you go to 9 speed.
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Old 11-14-10, 01:29 PM   #6
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Originally Posted by MileHighMark View Post
If you change the front mech to a road unit, it may not index correctly because of the different cable pull ratios.
The Shimano FD-R453 front derailleur has a cage that matches "road" diameter chainrings and a cable pull ratio that matches "mountain" shift levers. I have this setup on my recumbent and it works perfectly.
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Old 11-14-10, 01:34 PM   #7
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Originally Posted by nwbikeman View Post
Another problem you might have is if the bike you want to change has top tube cable routing. Road bike front deraileurs are only bottom pull so the cable runs under the bottom bracket and not from the top tube., Also Sram makes a cassette with an 11 tooth high gear cog in 8 or 9 speed. I think Shimano only goes to 12 tooth till you go to 9 speed.
Incorrect. Shimano's had 11 tooth small cogs on 7 and 8-speed cassettes*. IRD also has 11-tooth 7-speed cassettes.

*Going back to Dura-Ace Uniglide, 11-tooth cogs were available for 5 and 6-speed cassettes.
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