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forum
Hills and bad knees
Hi all
looking to see if a medium cage deraileur could support a 11-34 or 36 casette
Running a 105 50-34 chainset, 105 RD 5800 GS deraileur 11sp
If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.
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3 comments
34 will be fine if it's the GS, 36 might be pushing it
I have (I think) the medium cage 105. Def the 5800, ~90 mm between the pulley centres. Has run 32t from new. Other bike has same size Tiagra and I switched that from 28 to 34 (& still really struggled in the Lake District!). Both shift perfectly once the B screw is adjusted to get the chain tensioning right. The 28-34 switch didn't even seem to need a longer chain.
Alledgedly these derailleurs can cope with 40t.
The 105 vs SRAM Rival article that has been, er, re-released to a grateful audience today, also contains the suggestion that the R7000 105 medium cage derailleurs can do 40t. 5800 not very different So fill your boots with spinny gears.