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8 speed to 10 speed conversion project!

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8 speed to 10 speed conversion project!

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Old 07-10-18, 06:11 AM
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Plainsman
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8 speed to 10 speed conversion project!

I have a project in mind, but want to make sure I'm not missing something. Contemplating converting an 8 speed folding bike to 10 speed. I already have an Ultegra 6700 RD, a Tiagra FD, new 10 speed chain, and a 10 speed 12-30 cassette in my parts bin. From my Sheldon Brown reading, I understand that all Shimano 8 speed hubs are 8/9/10 compatible as long you use the right spacer. 10 speed cranksets and a new BB are easy to come by. Are there any potential issues I should be aware of in this conversion? I will need to find a pair of 2x10 trigger shifters that work with mech disc brakes, and that's one part I'm not sure about. I taught myself to tinker by building up a road bike from the frame up, but I know nothing about the flat bar shifting world. Any advice, or recommendation on a decent and economical 2x10 shifter set would be great! Thanks!
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Old 07-10-18, 06:20 AM
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You donít need a 10-speed specific crankset.
To use a road-style FD you need a road-style flat bar shifter.
Unless you need it for the tooth count, itís often easier/cheaper to source parts if you stay in the MTB flat bar family.
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Old 07-10-18, 06:30 AM
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Thanks. I see lots of 3x options out there. Any go-to mtn shift group you would recommend that is 2x10 and works with mech discs?
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Old 07-10-18, 01:19 PM
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10 speed mountain bike shifters will not work with road derailleurs. You need flat bar road bike shifters that are compatible with the derailleurs you plan to use. Most flat bar shifters do not include brake levers. You can use any brake lever you wish, mechanical or hydraulic

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Old 07-10-18, 06:31 PM
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Originally Posted by alcjphil View Post
10 speed mountain bike shifters will not work with road derailleurs. You need flat bar road bike shifters that are compatible with the derailleurs you plan to use. Most flat bar shifters do not include brake levers. You can use any brake lever you wish, mechanical or hydraulic
My understanding was that you could use an MTB rear derailleur on an otherwise road bike (ie, road shifters are compatible with MTB RD). Why wouldn't the opposite arrangement (MTB shifter with Road RD) also work?
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Old 07-10-18, 06:43 PM
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Originally Posted by Litespud View Post
My understanding was that you could use an MTB rear derailleur on an otherwise road bike (ie, road shifters are compatible with MTB RD). Why wouldn't the opposite arrangement (MTB shifter with Road RD) also work?
Because everything fell apart when Shimano introduced 10 speed mountain bike shifting and fractured again when they introduced 11 speed road shifting. Even before that front road and mountain bike derailleurs only worked with shifters designed for one or the other
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Old 07-11-18, 08:10 AM
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Maybe you've already covered these points but you need to check

1. is the rear drop out wide enough for 10 speed cassette
2. check the hub part number make sure it will take a 10 speed
3. as mentioned above 10 speed road & MTB do not cross match, there maybe rare options but you need to study the Shimano cross reference component sheet, to see what parts match up with what parts. I recently went through a similar exercise to allow my 10 speed CF road Tiagra set to carry me (now getting older) up hills, even the 4600 & 4700 10 speed do not cross match up.
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