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Singlespeed Cyclocross Build (Part 1)

October 21, 2018 Alexandra Painter
Trek Crockett Frameset

Funny thing, I bought the pedals for this bike before I even bought the frame.  I knew I would be building the bike within a year, and I knew which pedals I wanted that just got released by Trek, so I bought the pedals first.

Trek Crockett with Bontrager Pedals

The frame is a 2019 Trek Crockett in what they call Miami Green, and it is beautiful.  I had my eye on it from the moment I saw it after choosing not to buy the limited edition gold frame they did the previous year. 

The decision to go singlespeed was a little more difficult. I like my gears, but hydraulic shifters, Sram or Shimano, are not easy to come by used and are not cheap. I also ride a single speed hybrid on the greenway, which is fun, so I thought maybe this could be a new challenge for me to attempt. It meant I only needed brakes. No shifters, derailleurs, or other major drivetrain parts other than the crankset.

A simple google search of single speed hydraulic brakes led me to purchase the TRP Hylex brakes and levers, and as you can see in the pictures, no calipers on the bike yet. I also forgot my handlebar at home. The calipers do require you to purchase adaptors and screws in order to install them, which I overlooked. They also already have the hoses attached on both ends, and my frame is internally routed, so I will be detaching and cutting at least the rear if not both. For rotors, I prefer two piece rotors and to stick with one brand, so I bought TRP two piece centerlock rotors, which did not come with lockrings, which led me to buy Shimano lockrings for them.

The wheels were a difficult decision. I could have gotten a reasonably good price on a set of wheels from Shimano, like I put on my husbands bike, but I like a slightly wider internal width to my rims, especially since these will have cross tires some day. I needed centerlock hubs as well, which is something not found in all brands. I ended up going with Bontrager Paradigms, because I run the Paradigm Comp most of the year on my Madone and have enjoyed them as a good aluminum set, and they met all of my standards.

Trek Crockett Partially Built

The easiest part of this bike was picking out the crankset and stem. I knew I wanted to run a Sram one-by cross crankset, and I knew which bottom bracket it had to fit from looking at the Crockett 7. I ride a 170 mm crankset on all of my bikes (I will swap any bike that comes with a 165), so the crank length was determined. I wanted Apex, because it was the cheapest, and I got a 42 tooth chainring, because that was what came with it. The stem was all about fit. On a men’s geometry 52 cm bike I run a 80mm 7 degree stem with one 5mm spacer above it and the stem turned down.

During my downtime I have installed all of the parts I can on to the bike, and I am waiting for a chain, brake adaptors, tires, a rear cog, a spacer kit, and then I should be good to ride. Part two will cover a little more of the tech side of setting up the single speed on this bike as well as how I picked the size of the cog and the final fit adjustments.

Tags Trek Crockett, Cyclocross, CX, Trek Women, Trek Bikes, Frame Build, Singlespeed, Single speed, bike build
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My name is Alex, and I am a cyclist, triathlete, bicycle mechanic, swim coach, and for the vast majority of my week, I am a tax accountant.  I write about my experiences working on bikes and the places I ride and train.  My hope is to share information that is both useful and entertaining for cyclists and triathletes through my blog, as well as my Youtube channel.

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