Shimano 8sp trigger with 105(5700 or 5800) rear derailleur
02-27-21, 10:03 PM
#1
Senior Member
Thread Starter
Shimano 8sp trigger with 105(5700 or 5800) rear derailleur
So I'm building a budget 1x bike and have an 8 speed Shimano (Alivio?) trigger shifter and a 5700 long cage 105 and a 5800 short cage 105 derailleur I want to use. Are either of these compatible with the shifter? I've seen alternative cable routing on other builds that accommodate for the difference in cable pull.
What are my options other than buying a new derailleur?
What are my options other than buying a new derailleur?
02-28-21, 09:53 AM
#2
Constant tinkerer
Usually people are going the other direction, using brifters or other "road" shifters with MTB rear derailers to get more range.
But anyway, 5700 is 10-speed so it'll work, no questions asked. But you're still limited to the max cog of that RD.
5800 is 11-speed and with Shimano 11 they abandoned the pull ratio they used forever. So the 5800 will NOT work.
But anyway, 5700 is 10-speed so it'll work, no questions asked. But you're still limited to the max cog of that RD.
5800 is 11-speed and with Shimano 11 they abandoned the pull ratio they used forever. So the 5800 will NOT work.
02-28-21, 10:48 AM
#3
Senior Member
Thread Starter
Usually people are going the other direction, using brifters or other "road" shifters with MTB rear derailers to get more range.
But anyway, 5700 is 10-speed so it'll work, no questions asked. But you're still limited to the max cog of that RD.
5800 is 11-speed and with Shimano 11 they abandoned the pull ratio they used forever. So the 5800 will NOT work.
But anyway, 5700 is 10-speed so it'll work, no questions asked. But you're still limited to the max cog of that RD.
5800 is 11-speed and with Shimano 11 they abandoned the pull ratio they used forever. So the 5800 will NOT work.
03-01-21, 03:37 PM
#4
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Yep, what FastJake said 
03-01-21, 10:36 PM
#5
Constant tinkerer
It's worth noting that there are (probably) literally millions of Shimano MTB rear derailers made since the late 1980s that will also work and may allow a larger max cog than your 105, which might be useful for a 1x setup. If you look and you're not picky about hierarchy, these should be easily available used in the $10 range.
03-02-21, 11:29 AM
#6
Senior Member
Thread Starter
It's worth noting that there are (probably) literally millions of Shimano MTB rear derailers made since the late 1980s that will also work and may allow a larger max cog than your 105, which might be useful for a 1x setup. If you look and you're not picky about hierarchy, these should be easily available used in the $10 range.
