adamhell
07-06-2019, 04:20 PM
hello PL,
asking for some help or wisdom since i am having a new problem. i recently sold my crust evasion and replaced it with a crust bombora.
most all the parts were swapped onto the new frame successfully, except the shifting no longer works perfectly as it once did. it's set up 1x11, with sram rival 1 mated to a gx 11sp rear der. it's my understanding the cable pull is compatible between the road shifter and the mtn rear der, and this is evidenced by how this setup worked perfectly on the first bike.
what's happening now is the indexing is perfect for half the cassette (upper or lower depending on how much i tighten the barrel adjuster). the other 4-5 cogs are suuuuper jumpy. if i barrel adjust so it shifts into the 42t cog, then it won't shift into the 11t cog, and vice versa. somewhere in the mid range it gets all jumpy and screwed up (ie it only shifts well in ~half of the available cogs)
here is what i've tried so far:
- derailer hanger was inspected and brought into alignment at my local bike shop (though it wasn't super off since it's a brand new frame)
- housing and cable replaced (shimano teflon-coated cable for maximum slippery)
- several hours messing with the indexing, limit screws, and b-limit. (my local bike shop also had a go of it after they straightened the hanger - they were stumped)
- chain shortened to accommodate chainstay length difference
- multiple cable routing/position @ clamp. here is how it is currently routed:
https://nuxx.net/gallery/d/110004-2/IMG_8953.jpg
i am beginning to think there is something off about the shifter or derailer. perhaps the der cage is bent? there also might be some sand in the shifter mechanism?
has anyone had a similar problem where the obvious culprits (most notably derailer hanger) were not to blame? anyone have any other solutions to try?
thanks in advance!
Adam
asking for some help or wisdom since i am having a new problem. i recently sold my crust evasion and replaced it with a crust bombora.
most all the parts were swapped onto the new frame successfully, except the shifting no longer works perfectly as it once did. it's set up 1x11, with sram rival 1 mated to a gx 11sp rear der. it's my understanding the cable pull is compatible between the road shifter and the mtn rear der, and this is evidenced by how this setup worked perfectly on the first bike.
what's happening now is the indexing is perfect for half the cassette (upper or lower depending on how much i tighten the barrel adjuster). the other 4-5 cogs are suuuuper jumpy. if i barrel adjust so it shifts into the 42t cog, then it won't shift into the 11t cog, and vice versa. somewhere in the mid range it gets all jumpy and screwed up (ie it only shifts well in ~half of the available cogs)
here is what i've tried so far:
- derailer hanger was inspected and brought into alignment at my local bike shop (though it wasn't super off since it's a brand new frame)
- housing and cable replaced (shimano teflon-coated cable for maximum slippery)
- several hours messing with the indexing, limit screws, and b-limit. (my local bike shop also had a go of it after they straightened the hanger - they were stumped)
- chain shortened to accommodate chainstay length difference
- multiple cable routing/position @ clamp. here is how it is currently routed:
https://nuxx.net/gallery/d/110004-2/IMG_8953.jpg
i am beginning to think there is something off about the shifter or derailer. perhaps the der cage is bent? there also might be some sand in the shifter mechanism?
has anyone had a similar problem where the obvious culprits (most notably derailer hanger) were not to blame? anyone have any other solutions to try?
thanks in advance!
Adam