Can I change my 8 speed to a 11 speed
Converting an 8-speed wheel to 11-speed
You will have to buy a new 11-speed wheel and replace the entire wheel. On the other hand, if your current wheel is an 11-speed wheel, you can change to 11-speed by removing the low spacer from the low side of the 8-speed sprocket and installing an 11-speed sprocket.
Can I put an 11 speed cassette on a 7 speed hub
11-speed MTB hubs also use 135mm spacing unless the system is boosted in which case the dropouts have to be even further apart. Therefore, if you're trying to combine an 11-speed hub with a 7-speed cassette on a 7-speed frame, you will face a compatibility issue – the hub won't fit into the frame.
Can I put a 12 speed cassette on 11 speed hub
Yes you can run a 9/10/11 & 12 speed cassette on a shimano free hub, a Sunrace 12 speed will fit.
Will a 11 speed cassette fit a 10 speed hub
It will shift fine with a Shimano or SRAM 11-speed system. And in case any of you were wondering, if you have a 10-speed Shimano or SRAM system and buy a wheelset now, you can still run 10-speed cogs on that wheel. To put a 10-speed cogset on an 11-speed freehub, you just put a spacer behind the largest cog.
What size cassette will fit my bike
Most road bike cassettes have an 11, 12, or 13-tooth smallest sprocket, then between 21 and 32 teeth on the largest sprocket. The vast majority of road bikes come with a 12-25 cassette, which is suitable for most cycling terrain when paired with a compact or standard chainset.
Can I replace an 8 speed cassette with a 11 speed cassette
An 8 speed cassette is the same width as an 11 speed cassette. The 8 speed gears are wider and spaced slightly farther apart. The chains are different as well, the more gears, the narrower the chain. But 8 speed components and 11 speed components are not compatible.
Can I put a 10 speed cassette on a 7 speed hub
10 speed and 7 speed bikes have the same dropout spacing: 135 mm. Your issue will be with the rear wheel – you cannot fit a 10 speed cassette on a 7-speed wheel (you can go the other way with a spacer). If you want to upgrade from 7 to 10 speed, you will need a new rear wheel and new shifters at a minimum.
Do all cassettes fit all hubs
Most cassette hubs are compatible with Shimano cassette cogs. SRAM cassettes and most Miche, IRD and SunRace cassettes use the same inter-sprocket spacing as Shimano, but at least some SRAM 10-speed cassettes do not fit aluminum-body Dura-Ace hubs. SRAM has three series of rear derailers.
Are 11 and 12 speed hubs the same
Both 12-speed setups from SRAM and Shimano share the same sprocket spacings and it's the same with both brand's 11-speed groups. That means that if you want to run a 12-speed Shimano group but don't want to get a Micro Spline hub, you could use a SRAM 12-speed cassette with either an XD or HG freehub body.
Are 11 and 12 speeds compatible
Condensed answer: A 12-speed chain can work with an 11-speed cassette. However, it's recommended to avoid using a Shimano 12-speed chain because it doesn't play well with 11-speed chainrings.