Tiagra issue. New crank set required for Merida?

jonnya777
jonnya777 Posts: 20
edited June 2021 in Workshop
Hello :-).
I have a 2017/18 Merida ride 300. I want to replace the Tiagra pedal arms as the new chainring is a small fortune...Can anyone tell me what cranks would be compatible with the existing bottom bracket? Or would I have to change the bottom bracket as well. I just want a deore quality or even lesser brand to throw on.

The existing bb is rs500. The hollow style bb spindle is permanently attached to the drive side I think...Really want to spend as little as possible and not replace bb...what would slide into the the bb bearings?
All thoughts gratefully recieved,
Cheers,
Jon.

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