Triban 500 Shimano Sora question

[Dec66]

I have a B'Twin Triban 500 with triple Sora crankset (50/39/30).

Does anyone happen to know which type of 50T ring it uses as I need to replace it? I think it's an FC-3503 but I'm not 100% sure.

If anyone knows, or knows where I should look if it's stamped on anywhere, then please let me know... Ta

 

[bikingdad90]

Is it a Shimano Crankset or a pro-ounce one?
There is usually a marking, sometimes on the inside of the crank arm which will say something like 110BCD or 130BCD. As long as you get a matching chainring with that same BCD all should be well

 

[weareHKR]

As @bikingdad90 said...
For info, the BCD - is the diameter of an imaginary circle running through the centre of the chainring mounting holes. 👍

 

[fossyant]

Any chainring with the 110 BCD and 50T will be fine. Loads of choice, although finding a Shimano one might be tricky as stocks are really low.

 

[Dec66]

Thanks all, I'll know where to look now.

@bikingdad90 - it's a Shimano Sora, not the Pro Ounce (or "Dunce", as it looked on the crank arm )... Mine was a later one after they swapped over (though still with the Microshift derailleur, which is actually pretty decent).

 

[Ajax Bay]

https://www.chainreactioncycles.com/shimano-sora-fc3403-triple-chainrings/rp-prod38171
But be certain BCD is 130mm and 5 bolt. Edit: The link above showed 50t availability, but not now.
9 speed, 76.4mm (between adjacent bolt holes) = 130mm BCD; 64.7mm = 110mm BCD

 

[Dec66]

Rather annoyingly I don't see BCD-anything. However the measurements between the centres of the bolts indicate a 130BCD.

 

[iluvmybike]

This be the one:
https://www.sjscycles.co.uk/chainri...m-bcd-5-arm-outer-chainring-d-type-black-50t/