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.

 

[livpoksoc]

Thanks all, really helpful contributions.

New chainrings being ordered tonight. Next week brings a new thing to learn to tinker with.

 

[Jenkins]

That outer ring is in severe need of changing. As per @Ajax Bay 's suggestion earlier, go for Spa Cycles own brand and treat yourself to a matching inner at the same time
Outer: https://www.spacycles.co.uk/m8b0s210p3054/SPA-CYCLES-110-BCD-Zicral-Outer-Chainring
Inner: https://www.spacycles.co.uk/m8b0s210p3055/SPA-CYCLES-110-BCD-Zicral-Middle-Inner-Chainring
The result...

 

[joeegg]

I made the mistake of buying a Stronglight 50t chainring for my Sram Rival chainset. The enormous power from my legs actually bent the teeth inwards making the chain rub on the front mech cage.Bought a genuine and no problems.
The enormous power was a bit wishful thinking !

 

[livpoksoc]

That outer ring is in severe need of changing. As per @Ajax Bay 's suggestion earlier, go for Spa Cycles own brand and treat yourself to a matching inner at the same time
Outer: https://www.spacycles.co.uk/m8b0s210p3054/SPA-CYCLES-110-BCD-Zicral-Outer-Chainring
Inner: https://www.spacycles.co.uk/m8b0s210p3055/SPA-CYCLES-110-BCD-Zicral-Middle-Inner-Chainring
The result...
View attachment 785108

Are these offset the same as Sram's own?

 

[livpoksoc]

And one more thing...with a 32t on the back, this bike is mostly great, but on a couple of 16% ramps in cornwall, I ran lut of gear. If I swapped the inner to a 30t or 32t, would that a) make climbing easier and b) would it mess up the rest of the drivetrain set up?

 

[Jenkins]

Are these offset the same as Sram's own?

Pass on offset, I know they're both 110BCD and were a direct swap needing no fiddling with the derailleur.