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Needing to replace the cassette on my cross bike, what can I go with? Currently it has a Tiagra 12/30 running a 105 rear derailleur . Could I go bigger, a 32 or 34 max cassette and still have the 105 rear derailleur work ok? Not looking to change anything besides the cassette if I don't have to .
 

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'brifter' is f'ing stupid
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Needing to replace the cassette on my cross bike, what can I go with? Currently it has a Tiagra 12/30 running a 105 rear derailleur . Could I go bigger, a 32 or 34 max cassette and still have the 105 rear derailleur work ok? Not looking to change anything besides the cassette if I don't have to .
Which 105 rear derailleur? You can easily look up the max cog size by using the magic of google, too.
 

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Banned Sock Puppet
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Is your 105 rear derailleur a short-cage (SS) or a mid-cage (GS)? Or I should ask, how long is your rear derailleur cage?

If a short-cage, no-can-do, nada, sorry.

If a mid-cage, a 32T will work. A 34T or 36T will also work, but only if you get one of these:

Wolf Tooth Roadlink > Components > Frames > Frame Parts | Jenson USA

Compatibility:
  • 10s Cassette Compatibility:
    • 11-32: Not Required (medium cage rear derailleur works)
    • 11-34: Single or Double Chainring
    • 11-36: Single or Double Chainring
    • 11-40: Single or Double Chainring (front rings can be no more than 14 teeth different e.g. 48-34)
    • 11-42: Not Supported
  • 11s Cassette Compatibility:
    • 11-32: Not Required (medium cage rear derailleur works)
    • 11-36: Single or Double Chainring
    • 11-40: Single or Double Chainring (front rings can be no more than 14 teeth different e.g. 48-34)
    • 11-42: Not Supported
    • 10-42: Not Supported

  • The RoadLink is compatible with ten- and eleven-speed Shimano road derailleurs and shifters.
  • The RoadLink mounts only to standard derailleur hangers.
  • Double chainrings are only supported with medium cage rear derailleurs
  • Triple chainrings are not supported (medium cage rear derailleurs cannot accommodate that big of a change)
  • Direct Mount-native frames and SRAM or Campagnolo drivetrains are not supported.
  • Due to the lack of a clutch mechanism on Shimano road derailleurs, secondary chain retention (front derailleur or chain device) may be needed, especially for rough- or off-road use.
  • Due to variations in derailleur hanger geometry, chainstay length, chainring size, B-screw adjustment, and suspension configuration, individual results will vary.
  • This 7.9mm max dimension is controlled by the Shimano spec, but a few derailleur hangers don't meet the spec. You can file a bit of the bottom "tang" of those derailleur hangers to install the RoadLink

 
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