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1

Mixing mountain (Tourney TX) and road (Sora R3000) components is tricky at best. But here the answer is easy because while the TX uses a square taper BB, the Sora crankset requires an outboard bottom bracket (cups threaded or pressed into the bikes BB shell with bearings that sit outside the shell). See Shimano's Compatibility Chart. These are completely ...


2

How much clearance do you have? The rear tire has to fit between the rear seat stays, chain stays and rim brakes (if you have them). Front tire has to fit through fork and rim brakes (if you have them). A wide front tire can also increase toe overlap (i.e. your toes hitting the wheel in tight turns). You’ll probably want to go as wide as you can. If you plan ...


4

If you can identify the specific part number on the crank (or just by looking at pictures online), Shimano provides a great deal of information online about compatibility. For example, if you are using the current Tourney FC-TX801 crank, it uses a standard threaded square-taper bottom bracket, so any square taper crank will work. The SORA R3000 crankset you ...


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In general, you may be able to check the bike manufacturer’s page for your bicycle. They will usually list all the components the bike is built with. However, the list may not be comprehensive, especially if the manufacturer mainly sells lower end brands. Bottom bracket standards can be confusing, because there are a number of variations. In this case, you ...


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