Replacing 50T chainring

[Dogtrousers]

My worn out chainset happened remarkably rapidly. Only about 4,000km / 2,000 miles or thereabouts ish. It was my first modern (>8 speed) bike and I didn't treat it as I should have.

This is just an awful warning of how fast these things can go south if you let them.

Two factors led to this (I think): 1: Running a life expired 10sp chain for ages. 2: Insufficiently aggressive cleaning. Sure I was cleaning it, but in a half-assed way. Since then my bikes get toothbrush scrubbing and jockey wheel gunk extraction plus re lube after every filthy winter ride and every 2 or 3 nice summer rides

 

[Ajax Bay]

As far as the 34t is concerned, I shall guess that you spend a high % in your large ring (in flattish Hampshire) and that's partly why it has worn faster than expected. So likely your 34t is fine: it's only had (say) 15% of the use.
You don't say but you will reduce the rate of wear by replacing chains once they're over 0.5% elongation - most people reckon to get through 3 chains per cassette. The alternative is to just run chain and cassette on together (and the economics may or may not make that preferred) but the relatively unseen downside is faster chainring wear.
So as @oxoman says . . .

 

[Spiderweb]

I replaced mine recently, https://www.spacycles.co.uk/m8b0s113p930/SPECIALITES-T-A-Zephyr-110-BCD-outer-40-56t-Chainring

 

[si_c]

My worn out chainset happened remarkably rapidly. Only about 4,000km / 2,000 miles or thereabouts ish. It was my first modern (>8 speed) bike and I didn't treat it as I should have.

I had similar issues with an FSA crankset on my old Felt, around 3k km winter riding, I'd gone though a couple of chains, a cassette and the chain started slipping when on the large ring, got another one, was dead by middle of summer. Replaced the crankset for one with Shimano rings which then lasted two years with no discernable wear. Both use aluminium as the material for the chainrings and no change in how I maintained the bike. Other Shimano kit has remained similarly reliable.

 

[Dogtrousers]

I should add that the crankset that I so efficiently destroyed was SRAM Apex. Maybe Shimano would have failed just as quickly in the same circumstances. Maybe not.

 

[All uphill]

For comparison I'll tell you about the bike I'm about to service.

It's a 15 year old tourer which has covered around 25,000 miles. It has regularly had oil applied to the drivetrain, and been ridden until something makes a nasty noise or doesn't work.

It now needs its third front rim.
It needs its umpteenth chain and cassette and it's second big chainring.