mtb derailleur on a road bike?
05-19-04, 09:50 PM
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mtb derailleur on a road bike?
sorry for the newb question, bu i've seen plenty of road bikes spec-ed out with a road front derailleur but a mtb on back.
why do this? does it cause the ride to act any different than if a road derailleur were back there?
why do this? does it cause the ride to act any different than if a road derailleur were back there?
05-19-04, 09:56 PM
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A mtb derailleur might come in handy if you had a big cog in the back for hills. Other than that, the ride quality should be the same.
05-19-04, 10:04 PM
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Originally Posted by Fixed Up North
A mtb derailleur might come in handy if you had a big cog in the back for hills. Other than that, the ride quality should be the same.
05-19-04, 10:55 PM
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Originally Posted by asterisk
the machine I'm talking about here has a Deore rear on a HG-50 8-Speed 11-30t cassette, to put it in context.
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05-20-04, 06:29 AM
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Normally one would use a mtn Bike derailleur to cove a large range of cog diameters. I use an 11 to 34 XT cassette on my road bike with an LX der. Same goes for the front. I use 22/32/44 chain rings so I use an XTR mtn bike front der. Works very well with STI's.
The original road 105 der did work, but not as well as the XTR.
Al
The original road 105 der did work, but not as well as the XTR.
Al
05-20-04, 11:54 AM
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Is it a double or triple crank? Most slack comes from the major size difference of the 24t-50t chain rings as far as slack adjusters are concerned. The rear derailer its self may need to take a different path as it moves side to side because of the steep slope from smallest to largest cog. The Rear derailer doesn't just move side to side it also needs to go up and down to approximate the slope of the cogset. road =shallow, close ratio; mtb= steep, wide ratio.
You could mix em to fit the situation if nessesary, with a short road style slack adjuster on a mountain rear derailer if you had a close ratio double crank and a wide ratio cogset and wanted to save a little weight and clearance. Or a road style rear derailer with a long slack adjustor for a close ratio rear and a triple crank. Note I haven't tried these combos its still theory so don't come to me if it dosen't work.
You could mix em to fit the situation if nessesary, with a short road style slack adjuster on a mountain rear derailer if you had a close ratio double crank and a wide ratio cogset and wanted to save a little weight and clearance. Or a road style rear derailer with a long slack adjustor for a close ratio rear and a triple crank. Note I haven't tried these combos its still theory so don't come to me if it dosen't work.
