Rear sprocket studs ,and portable tire inflation questions

[Bill Hilly]

I have had no trouble from my Brozz, but I know that they can sheer off the rear sprocket studs , and if replacing them with better ones can prevent it, I would feel better doing it before they fail if they are really as bad to sheer as what it seems they are from what I gather. What are the proper replacements for the studs? I would also like to hear your thoughts on compact tire pumps. I see several varieties"and styles on Amazon. Thanks.