This build is the Coda on a long a glorious collab between MASH and Santa Cruz.. This is the MASH STIGGY TRACKCX - the lightest tracklocross bike ever built. (this statment has not been approved by the UCI, FDA, FCC or any other BS organization).
As is stands now (2025) this build tips the scales at 15.1 lbs (6.8kg or 1.07 stones) - before we dive in, lets have ourselves a little walk down memory lane. BUT FIRST.. this is technically the 1st version of the SC carbon stiggy.. (before it wa
This was the 2nd MASH X SC collab. I was racing for LOWxTCB in 2016 when the “ALERT” frame came out so this was my first Stigmata.
This was a new design by Al Nelson. Al came up with Walton and Kyle in PDX and has designed a ton of MASH frames over the years.
The 2017 CX cup in Santa Rosa CA was one of the first times the team raced the new design. The frame geo remained untouched from the previous year. That is to say agressive.. this one of the best CX race bikes I had (of have) ever ridden, pure spe
Fast forward to 2018 the design for a refresh and the team got new matching kits.
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There is something about a fully matching race kit, helmets, shoes, bike, kit.. that just feels so PRO
Post 2018 CX season SRAM had just launched the 12spd AXS groups so I rebuilt this v2 with a full SRAM RED groupset with ZIPP 303 wheels and tubeless tires. At the time the 10-33 rear cassette and 46/33 front rings were close to traditional cross gea
700×35 tubeless tires and a 10-33 cassette were cutting edge stuff back in 2018. It’s funny to think this is what I run on Road Bike now days (with even easier gearing LOL).
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Selle San Marco did this collab with MASH for the 10 year but I always thought it was made for this frame.
Eventually I got a Stiggy v2 and I had this frame rebuilt with a 11sp CX group by KAWS at CVC.. and I think I raced one CX race on it LOL.. It just wasn’t in the cards. But after 2020 MidSouth I had to retire the v2 and so this v1 was rotate back to
1x gravel goodness, post CX rebuild, this became my go to gravel bike for a season. While it was weird to go back to 11spd mechanical shifting the real reason this never work out was.. this frame was just too agressive for gravel, the geo was too t
SO, now that we’re all caught up.. lets dive into the latest and probably last iteration of this MASHxSC v1 stiggy.. First things first.. yes it’s fixed, yes it is BB30, HOW DO I TENSION THE CHAIN?!?!? read on and find out.. And let’s all appre
The chain is tensioned with a “ONER” by squid bikes in Sacramento CA. This is an eccentric bottom bracket. ec·cen·tric /ikˈsentrik/ technical: (of a thing) not placed centr ally or not h av ing its a xis or other part placed central
So in this case the BB bearing and spindle of the cranks are not places centrally within the BB shell. So when you rotate the BB shell the spindle effectively moves back and forth and up and down.. in a circle. This movement gives about 4-5mm of m
Here is a poorly drawn illustration of how you get chain tension from an eccentric BB
Once everything is tensioned and tight it’s locked down, you can skid and sprint to your hearts content. It creaks like crazy sometimes (carbon BB30 FTW) but in the year it has been built i’ve never had it slip. However the eccentric motion of
Before anyone asks.. the ratio is 44×18. I really wanted to run a track 1/8 inch drive train, but all the cranks I could find that worked on this setup were 110bcd… Enter Milwaukee Bike Co. which for some unknown reason made 110bcd 1/8 inch chainri
The first set of cranks I had for this built were 172.5’s, they were just the cranks I had laying around and they set up fine. However I had to inadvertently position the BB at the lowest point of the eccentric rotation to get chain tension. SO w
You know what is hard to find.. 165mm CX cranks. ESPECIALLY BB30 1654mm CX cranks.. they made them for like 1 year and for like 5 people. Luckily after a lot of searching and pleading a product manager at ZIPP who is just weird enough to want some
The real gem here are the wheels.. 100% without a double the lightest most baller TRACK CX wheels out there (don’t fight me..just make wheels that are lighter). The supreme KOOKS over at PAUL make the FIXED WORD hub.. a thru axle fixed rear hub
Any manufacturing process in imperfect.. things get fucked up and trashed.. sometimes it’s something big like holes where there should be no holes…and other times it’s much simpler..like say a miss placed decal. I was beyond lucky to get a set of
My buddy John Boy laced up these rims with some Sapim CX ray bladed spokes and BOOM! A stupid light thru axle fixed rear wheel, ready for whatever.
The v1 stiggys max out around 700×40c tires, and I knew I needed all the rubber I could get. Enter the ZIPP 700×40 gravel tire the G40, fast centerline and some limited knobs were perfect for the local TRACKCX courses. I generally keep em at 27-3
The front wheel is not nearly as cool as the rear, it is just a stock 353NSW with some “light” re-milling of the spacers to accommodate the 15mm front thru axle. These first generation stiggy’s still had a lot of SC’s MTB roots in them…so the front
Popping off the disc rotor really cleaned the front wheel up.. and while I have been meaning to get a PAUL front hub built up to match… not sure if I can spare the grams…
In keeping with the “lightest TRACKCX ever” vibes I threw on a 3D printed Fizik Vento Argo 3. I like this shape and I’ll do anything save a few grams… including running a ZIPP SL 27.2 carbon seatpost.
Got my name on the toptube.. just like the pro’s.
This is the same Al Nelson design from the 2017 yellow team CX frames, just shifted to a more greyscale color palette.
Subtle MASH branding kept things discreet.. If you knew, you knew.. There were roughly a dozen of these frames ever made, and all of them went to team riders or to the MASH archives. SO NO YOU CAN’T BUY IT ANYWHERE
A 110mm ZIPP Service Course stem paired with some riser bars rounds out the cockpit. These risers are some MASH prototypes that never saw production, but they match the build, and I love the low rise and subtle sweep.
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You already know.. TIME ATACs for life. These are some robust ATAC Aliums that Duke sent me from London. They don’t have tension adjustment, but I’ve also never come unclipped….
Like any good track bike, clearances are tight. These 700×40’s max out the frame. The 44t 1/8 inch front ring barely clears the frame. And even with the 165mm cranks.. there is still a bit of toe overlap…just as it should be.
Keep it tight. These tires are skid relatively well, for a tubeless set up. A lot of people are scared to skid on tubeless, and I will admit I was one of them for a long time. But in my experiences there is not a huge danger of puling the tire
Here you can clearly see the notch in the eccentric BB to adjust the tension. Squid makes a specific tool, but you can also use a normal lock ring tool in a pinch.
The eccentric BB does work best with special tools. I got a cheap BB lockring tool off the internet and it it down to fit. You also need a stubby 4mm to tighten the bolts that compress and lock the BB shell into place. It needs to be stubby to fi
The only thing approved on this build is 420/69 DGAF. SEND IT
This bike was built up for SSCXWC 2023 in Santa Cruz CA (fitting right!?!) and as you can see.. I really sent it
While this was a full TRACKCX build, made for short courses and hard skids…. Nico and I had been talking about doing Midsouth fixed for years… and 2024 was our time to shine! 106 miles for OK red dirt was the perfect opportunity to put on a sligh
Right after the initial build Mike Martin and I went out to document this project before it got covered in filth and or broken.
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