Frequently Asked Questions
Q: What should I do if checkout shows “Bad Gateway” or will not load?
A: Refresh the page, then try checkout in a private/incognito window or another browser or device. Turning off a VPN or browser extension and switching network can also help. If Shop Pay is the problem, choose another available checkout or payment method.
If it still fails, contact us with a screenshot, the time of the error and what is in your basket. Do not send card details or verification codes.
Tips & guides
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Great North Run 2026 Fuelling Guide and Order D...
A simple Great North Run fuelling plan, plus the final KMC delivery deadline and where to find KMC in Newcastle before race day.
Great North Run 2026 Fuelling Guide and Order D...
A simple Great North Run fuelling plan, plus the final KMC delivery deadline and where to find KMC in Newcastle before race day.
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What Is a High-Carbohydrate Energy Gel? GEL X E...
GEL X is KMC’s next-generation high-carbohydrate energy gel, built with 45g carbohydrate, a 1:0.8 carbohydrate ratio, 200mg sodium and a Neutral Cooling profile for long runs, rides, races and triathlons.
What Is a High-Carbohydrate Energy Gel? GEL X E...
GEL X is KMC’s next-generation high-carbohydrate energy gel, built with 45g carbohydrate, a 1:0.8 carbohydrate ratio, 200mg sodium and a Neutral Cooling profile for long runs, rides, races and triathlons.
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Meet GEL X: The New High-Carb Energy Gel From K...
Meet KMC GEL X, a 45g high-carb energy gel developed over 18 months and tested by 300+ athletes. Learn how it works, how to use it and which KMC gel...
Meet GEL X: The New High-Carb Energy Gel From K...
Meet KMC GEL X, a 45g high-carb energy gel developed over 18 months and tested by 300+ athletes. Learn how it works, how to use it and which KMC gel...