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Mixing 'road' and 'mountain' components.

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Mixing 'road' and 'mountain' components.

Old 08-27-05, 09:50 PM
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askbertie
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Mixing 'road' and 'mountain' components.

Here's the current set-up. (Yes, I know it's terrible; feel free to laugh.)

GT hybrid frame. Shimano 7-speed HG cassette (with cheap-and-cheerful C101 derailleur). Original-equipment, welded-together (C101?) triple crankset, something-something-48 (which is too low-geared for my ride to work). Bargain basement, Shimano MTB front derailleur. Shimano C101 indexed twist-grip shifters.

I'd like to put on an old, '8-speed compatible' Sora 30-42-52 crankset. I realise the curve of the MTB derailleur might be too tight for the larger chain ring - is that important? Is it just a case of shifting the derailleur up a bit? What's the likely difference, in actual diameter, between a 52 and a 48 tooth chain ring? Is the gap between rings (the lateral chain movement) the same on MTB and road-bike cranksets - will my indexed shifters work with the Sora? Is it worth it - will four more teeth make a noticable difference in top gear?
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Old 08-28-05, 05:15 AM
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Retro Grouch 
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I suspect that you'll have to replace the bottom bracket to match the new crankset. Your Sora triple crankset needs a 118mm spindle. It's not something that I've done, but I'm pretty sure that everything else, including the front derailleur will work fine.
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Old 08-28-05, 07:15 AM
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eandmwilson
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I had a similar setup on my bike, but with an 8 spd cassette and index shifter (including the dread C101 RD and other junk), except I had the Shimano trigger shifter (which stunk--crappy quality). Since I had a straight bar, and wantted to keep things simple, I upgraded the 8 spd cassette to a 9, and got a new RD and shifters. But I'm still stuck with the something-something-48 front end, and am looking for any way to get a 52/53 on there.

Back to your question, when I upgraded the rear I put a SRAM road 9 spd cassette on the wheel and SRAM MTB 9 spd trigger shifters on the front. It works flawlessly (which is why I replaced the crappy stock RD/shifters in the first place), so form my single data point, I'd say yes, the lateral spacing appears to be fine IF you get similar branded components. I believe the SRAM shifters will work with the Shimano cassettes, but amy need some tweaking.

On Monday I'm stopping by the LBS that actually is more a repair shop than anything else and will see about the bottom bracket quaestion. For example, I'm pretty sure I'll need a new BB as the spindle length on my current one seems odd. I'll also ask about the front derailleur. I suspect that may be minor issue, as long as the vertical eight between your smallest ring and largest ring fit its range.
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Old 08-28-05, 10:15 AM
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Thank-you for your quick and helpful replies. I'll let you know how it goes. (^.^)b
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