This frame was really cool to see go from computer screen to reality. A few people said it looked Swan-like so…there you go.
Thanks to Walt and Brad for their help with this. I probably couldn’t have made it like this had they not given me great advice and in Brad’s case in-house gusset lessons.
KB wanted a 5″ fatbike with a Bluto and 2×10 gearing allowing a 20 x 42t for her lowest gear. She requested the lowest standover possible with a 80mm Bluto, BB height no less than 12.5″, and 4.8″ tires. I was able to get the standover (unsagged) to 695mm and lower as you get closer to the seat tube (~630mm). I bent the top tube to get it as low as possible but also to give a nice long coped interesection with the True Temper 38mm Supertherm downtube. The top tube comes into the downtube in the thicker butted section (1mm wall) and a big long gusset was added to strengthen the headtube junction made out 2″ diameter x 0.049″ wall 4130 straight gauge tubing. She also wanted her bars to be 4″ higher than her saddle. So this build was very different than anything I’ve attempted before.
Geometry: 68.5 degree head tube angle, 73 effective seat tube angle, 430mm long chainstays, 612mm front center, 41.4″ wheelbase.
Components: SRAM 10-spd twist shifters, Hayes Prime Expert disc brakes, Truvativ Noir T20 carbon riser bar, Thompson 70mm stem and seatpost, Surly Mr. Whirly Offset Double 165mm crank is on there with a 20x33t ring combo paired to a 10spd SRAM 12-36 cassette. But the cassette is a wide range 10, with a Wolf Tooth 42t ring and a 16t to replace the 15 and 17t rings. I used their longer B-tension bolt too to get it to shift right.
The front derailleur is a direct mount X7 mounted to the Wolf Tooth clamp for Moonlanders/190 rear hubs. Because of the weird crank when set up as spec’d (2mm from bottom of cage to top of big ring) the cage rubs the crankarm. It’s really easy to adjust the direct mount derailleur upwards and out of the way and it still shifts pretty good.
Wheels were built by Lacemine29.com and are Bontrager tubeless Jackalope rims laced to a 190 Fatback 10mm through-axle on the rear and a Borealis 150x15mm hub on front, Vee Rubber Snowshoe XL’s run tubeless! Very easy to set up without any tape on these rims. Super psyched about this. It didn’t work well (at all) for me using Lou/Buds. Headed to the Colorado high country!