In lower gears (larger diameter sprockets) the idler guard contacts the cassette sprocket in front of the chain and prevents it from slipping onto the larger diameter sprocket. It's advertised for mountain bikes but doesn't work with the larger sprocket (40+). A road/city bike will probably do, but I don't recommend it for a mountain bike.
Smartphone TECNO Pova 3 6/128 GB, Dual nano SIM, silver
64 Review
JOYSTAR 10"/12" Kids Balance Bike For Girls & Boys, Ages 18 Months To 5 Years, Toddler Balance Bike With Footrest & Adjustable Seat Height, First Birthday For Child (Black Blue Green Pink)
54 Review
9/16" 3 Bearing FOOKER MTB Bike Pedals Non-Slip Platform Bicycle Flat Alloy For Road BMX MTB Fixie Bikes
58 Review
OnePlus 10 Pro 12/256GB CN Smartphone, Dual nano SIM, Emerald Green
75 Review
Maddogยฎ Sports Padded Chest Protector, Tactical Half Glove, & Neck Protector Combo Package
23 Review
TAC9ER Kevlar Lined Tactical Gloves: Full Hand Protection, Cut & Temperature Resistant, Touchscreen Friendly For Men & Women
45 Review
OneTigris Multicam Helmet Cover For Fast Helmets In Size M/L And L/XL - Protect Your Headgear With Cloth Cover In Multicam Print
31 Review
OneTigris Tactical Half Face Mask: Foldable Mesh Protection For Women & Teens - 4.5 Inches
23 Review