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This was stock spec. The photos you see are with Conti CX kings in 35mm size, so plenty of clearance in there! Can dig it out and measure (with a ruler, accuracy not 100% guaranteed) after work if you want? PM me with where you’d want me to measure and I’ll send some photos over. Won’t be priced high, you’ll be doing me a favour at helping me clear out! PM and we can talk.
https://www.norco.com/bike-archives/2014/threshold-a3/
It may be a 2014/15 model year, I bought new end of season in 2015, used for one winter and a bit of summer and then it’s sat in a shed in various stages of built-ness for the last few years. Looking at Strava, it’s covered 600km 🤦♂️
I’ve got a small Norco CX frameset going. All the mounts you want, and decent clearance for mud and/or large tyres. found it somewhere between a 52 and 54 in sizing (I’m 176cm, usually 54/56 frame) when I had it built up as a winter road hike for a winter before deciding it was a little small for me. Geo (and a few more pics) in this comment:
https://www.lfgss.com/conversations/355563/#comment15598390