SunRace adds affordable, lightweight 10-52 cassettes, complete 1×12 groups

Not enough of a difference to matter. SRAM is 3.65mm, Shimano is 3.55mm. That aside, the freehub doesn’t dictate the sprocket spacing.

Tooth increase Step size.

With the exception of the 28-34 @21%, those 6t steps on the 10-52t cassette are are all smaller than the 20% 2t jump from 10-12. They’re not super-even, but there are shift ramps to think about and the worst is still smaller than the biggest step in a Force 11-36 road cassette.

For the nerds:
10-52: 20% 17% 14% 13% 17% 14% 17% 21% 18% 15% 13%
10-50: 20% 17% 14% 13% 17% 14% 17% 14% 13% 17% 19%

Actually I race a Sunrace 11-46t cassette and am winning my age group in the northern Thailand xc series.The Sunrace cassettes are quite durable for me at 67 kilos and I ride about 250-300 kilometers per week. I use a KMC chain and XT rear derailleur and shifter. My current Sunrace cassette has lasted almost a year now and works almost flawlessly. I owned a Sunrace 11-42 before this one and it worked fine. the thing I found to be the case is let the chain break into the cassette for a bout 150 kilometers before you critique it. Mine skipped a bit before the first 100 kilometers or so, but after , I’ve only adjusted it occasionally. The 6 tooth spacing is fine for climbing as I often only have to downshift once when climbing rather than twice with a closer ratio low end. I would recommend them to anyone and that’s for racing as well as general high mileage riding. I would also point out that as the cogs get larger, there NEED to be more teeth between jumps to make a full gear change difference. the very least you should have with 34 teeth or larger cogs is a 4-5 tooth difference and a 34 to 40 and 40 to 46 work well racing for me.