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I have a urban commuter bike. Since last couple of months, the spokes at the rear wheel keep breaking after each ride. I changed the broken spokes couple of times. Also I replaced all the spokes. Same thing keeps happening. I weigh around 90 Kg. I have had the bike for 2 years and covered only 6000 Km. I check the spokes before going for a ride. Almost never have I found a loose spoke and yet after the ride I find one broken. Should I replace the whole wheel or just the rim/hub? Is my weight the problem here?

Edit- 1) Being a complete amateur in the field, I didn't know what details mattered. The wheel is Double walled 36H with double cross lacing (Both sided).(This is an assumption. I am attaching photographs to make things clear.)
2) I didn't change the spokes myself. I had it done from a shop.
3) I go over the curb or rather potholes (We have a lot of those here in India) moderately hard. Hub

Wheel

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    How many spokes on the wheel? How is it laced? Disk brakes?
    – Daniel R Hicks
    Nov 24, 2017 at 17:06
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    I don't think your weight is the issue necessarily because i weight about the same as you if not a bit more and am not regularly breaking spokes. More information would be helpful such as spoke type, number of spokes, lacing type etc.
    – Nate W
    Nov 24, 2017 at 17:25
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    Is it a cheap BSO from a discount department store, or did it come from a bicycle shop? Do you bomb over curbs and railroad tracks, or do you go over gently? Please edit your original question to answer.
    – rclocher3
    Nov 24, 2017 at 17:25
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    Please tell us what the brand and model of the bike is. You say you replaced spokes, did you do that yourself or have a repair shop do it?
    – Argenti Apparatus
    Nov 24, 2017 at 17:43
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    There are special little washers, with a rounded edge on opening on one side, that can be used to fix this situation, but that would require rebuilding the wheel, and it is probably cheaper (and better) to just buy a new wheel.
    – Daniel R Hicks
    Nov 25, 2017 at 13:28

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This is not normal. A properly built wheel with quality spokes will not break spokes like this. The likely culprits are build quality (spokes over-stressed?) of spokes quality. Take your wheel to a bike mechanic and ask if the spokes tension looks right and if the cross-pattern is OK. If it does, then you are left with poor quality spokes; change them.

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