The ‘one by’ system has pretty much revolutionised the drivetrain of a mountain bike and since SRAM put in the test lab hours loads of other component manufacturers have started producing their own version of thick thin/wide narrow chainrings. The principle is pretty simple, deeper cut teeth combined with a shape that mirrors the alternating internal and external links in a chain offers more ‘grip’. The aim is to control the sideways movement of a chain. That combined with a clutch mech should keep the chain on the ring and on the whole means you don’t need to run any sort of chainguide. SRAM deserve huge praise for this development and whatever the (complex) situation with patents and the fact is that most companies have given the thick thin concept their own twist.

The TTr is Gamut’s version and comparing it to an XX1 ring it’s close in design but there are some differences. The teeth on the Gamut ring have a more traditional point to them but they do maintain a very similar height to SRAM teeth. They are nicely machined bits of kit with a hard anodised coating designed to hold up to wear.

The rings run on a 104 BCD (that’s Bolt Circle Diameter, the diameter of a circle drawn through the centre of the bolt holes in a chainring) so if you are running some SRAM cranks with a 94 BCD you will need Gamut’s own spider to get them to fit.

The rings comes in 30, 32, 34, and 36-tooth varieties, can be run on either side of the crank spider for the best chain line, and work with 9, 10, and 11-speed setups. Ours weigh 34g for the 30T ring, 36g for the 32T, and 52g for the 36T, and they’re all finished with simple graphics.

Price: £34.99