Originally Posted by
RrogerD
Is an SR Suntour chainset (cheap) JIS or ISO type?
JIS.
Originally Posted by
RrogerD
I guess that what you're saying is, remove the existing one, hopefully it has what it is stamped on the side, and then purchase the next size up?
Even if it's not stamped, you can simply measure the length of the spindle to find out.
Instead of just buying the next size up, I'd suggest measuring your chainline (before disassembly) so you know how far you'll need to move the crank outboard. Then buy a new bottom bracket in the right size to move it over as far as need be.