Callum Marsh

Callum is a lifelong cyclist and former bike-shop mechanic who commutes year-round in all weathers, so he has strong opinions about anything with wheels or a battery. At PickShelf he covers bikes, e-bikes, e-scooters, helmets and cycling kit, comparing power, range, safety standards and build specifications against live UK listings and the real-world notes in verified rider reviews. He is quick to flag a suspicious lumen or range claim and firm about safety certification. He does not ride-test every product; he researches the specs, the listings and thousands of owner reviews to sort genuine value from marketing.

How Callum Researches

Every recommendation on this page starts with a broad survey of the market: manufacturer specifications, independent expert coverage, and thousands of verified owner reviews on Amazon UK. PickShelf does not physically buy or lab-test the products; instead each pick is chosen by cross-referencing published specs against the live UK listing, the aggregated verified rating, and the recurring themes buyers raise in their reviews. Products with consistent quality complaints, misleading marketing, or poor value are filtered out.

You can read the full process on our How We Choose page.

Areas of Expertise

• Bike lights and cycling safety kit
• Cycling helmets (MIPS/WG11)
• Electric bikes (EAPC/UK road-legal)
• Electric scooters and micromobility
• Power/range/safety-standard verification