About to buy a seatpost. I have a choice between it taking either 7mm or 8mm saddle rails.

Any idea which one is industry standard. Never even realised they varied until today.

I ‘think’ 7mm is standard, that’s what all my carbon railed post’s are, and they’re the only ones I’ve ever bothered checking…

7 is the norm. 8 is dh oversized.

Cheers. Next connundrum, saddle is one of these:

http://www.pro-bikegear.com/publish/content/pro_2010/nl/en/index/products/saddles/special.-productCode-PRSA0015.html

Can’t see anywhere whether it’s 7 or 8!