In case anyone is wondering, on a Sora 9-speed derailleur, you can fit a 42 tooth sprocket and a 11-42 cassette with no issues. Shown on a 2016 Trek Crossrip Elite. : r/gravelcycling
Shimano Sora RD-R3000 9-speed Rear Derailleur - bike-components
Shimano Sora HG50 9 Speed Road Cassette | Chain Reaction
SHIMANO Sora Road Bike CS-HG50-8 8 speed 11-28t Cassett
Best cassette for my bike: What cassette do I need? | Cyclist
Is this Sora rear derailleur (rd r3000 gs) actually compatible with 8 speed cassette or is it seller mistake? Can't find any other information online. : r/bikewrench
Shimano Sora R3000 2x 9 Speed Groupset 5pcs RD Short Cage Cassette mShift 11-32T - Body Logic
Shimano Sora HG50 Cassette, Silver | Bikeinn
Shimano Sora HG50 9 Speed Road Cassette Reviews
Shimano Sora HG50 8 Speed Road Cassette | Chain Reaction
Shimano Sora RD-R3000 9 Speed Rear Derailleur | Bikebug
Review: Shimano Sora 3500 groupset | road.cc
Review: Shimano Sora 3500 groupset | road.cc
Shimano Sora HG50 8 Spd Road Cassette - Cambria Bike
Amazon.com : SHIMANO Front Mech Sora R3030 9s tpl 28.6/31.8/34.9, Black : Sports & Outdoors
SHIMANO ROAD Cassette 9-speed | SHIMANO BIKE-EU
A guide to rear derailleur cage length: Short, medium or long? | the accidental randonneur