Cyclocross - Shimano MTB deraileurs and STI compatability
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10-31-11, 12:43 PM
I have a full Shimano Deore drive train that I would like to use for a cyclocross bike with a pair of Tiagra STIs. I am pretty sure that they are both 9 speed. Will there be any compatibility issues that I need to deal with. I seem to remember reading something on Sheldon Browns website about Shimano using different spacing (and thus different cable pull) for there mountain and road components.
I am still new to working on bikes so I don't know all of the ins and outs but hope to learn as I go. Also, is there one book that is worth investing in or is YouTube really the way to go?
10-31-11, 01:07 PM
If they are both for 9 speed then you should be fine.
10-31-11, 01:30 PM
I use a Deore LX rear with 105 9-speed brifter. Works fine. One thing to check is which way the derailer moves when the cable is pulled. My rear derailer works opposite of a standard road derailer. Therefore, to shift to the bigger cogs I now have to click the inside lever and to shift to the smaller cogs I use the full brake lever. I didn't plan for this, but for a CX race or when using the bike on mountain bike trails I actually prefer this shift pattern since I tend to want a quicker shift to the lower gearing. Only issue is switching back and forth between the CX bike and road bike; I'll sometimes shift the wrong way if I haven't been riding one of them in a while.
10-31-11, 09:58 PM
It appears that the derailleur does pull the opposite way. Is it possible to run a rear long cage road derailleur with my MTB cassette and double chain ring?
The incompatibility is with the front derailleur. If you're running a double, that's not an issue. The rapid demise derailleur orientation isn't an issue except that you need to think backward about your shifting.
A mid-cage road derailleur (long cage by road standards) works with a 30T cassette and you might be able to get away with 32T. I had one setup that way but the derailleur bounced a little when I was on the big cog. Other people have reported having no trouble.
11-01-11, 11:19 AM
I have seen a few road cassettes that go up to 28 teeth and some MTB cassettes that go down to as few as 32 teeth, but I haven't noticed any that are 30. Do you know of any?
The new Tiagra 4600 10-speed cassette comes in a 12-30 variation.
See my review here: http://www.bikeforums.net/showthread.php/772972-Review-Tiagra-4600-12-30-10-speed-cassette
BTW, if you are talking about CX racing, as opposed to just riding off road with your CX bike, I don't know if 12-30 is the way to go. In my experience, the chain seems to find its way onto the lowest gear I have and if I don't limit how low that is while I'm not in the pain cave I find myself dropping off the back in a hurry. There are a very few cases where I like to have a super low gear but in general it tends to work against me.
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