American Custom Bicycles in Steel, Titanium and Ti/carbon mix
The Summer Scramblers
The idea was to design the fastest, packed dirt gravel racer we could, to incorporate Seven’s newest technology, and to make it all look great. The result won us Best Gravel Bike at the 2019 North American Handmade Bike Show (NAHBS). And now you can get that same bike for yourself!
We built this one-of-a-kind Evergreen PRO SL with our good friends Craig and Jeff from Summer Cycles in Del Mar, CA. They wanted a bike to tackle Southern California’s unique style of gravel riding, the sort of bike you might want for the Belgian Waffle Ride, but also super useful for an event like Dirty Kanza. This is another bike that showcases our ability to design and execute a bike deeply refined for its purpose.
Here are the features that make this bike special:
XX - You expect a fast bike to be fast, so we combed through this one to extract every gram we didn’t need. Judicious tube selection, aggressive tube butting, oversized internal breather holes, asymmetric dropouts and stays, all that saved us 7 ounces.
One-inch chainstays - A 1" stay is 55% stiffer than a 7/8" stay. The larger diameter helps us maximize power transfer.
Chopped drive-side chainstay - This segmented stay allows us to shorten the rear of the bike while still leaving plenty of room for large tires. Drawing the tire up under the saddle improves acceleration and traction.
Race-optimized Seven Ti/carbon frame - An 1-3/4" butted titanium downtube wed to a 44mm headtube make the leading edge of this frame impervious to oncoming terrain. The carbon tubing lightens the whole package and incorporates some race worthy stiffness. Every tube here is chosen deliberately to balance speed with just enough compliance to keep the rider planted on the bike.
Custom paint design - We started with Summer’s vibrant shop colors and then created layered stripes that cause the bike to blur when ridden at speed.
Our takeaway from NAHBS was that technology matters. Show bikes need to look great, but there has to be more beneath the surface. The judges responded to our work in exactly the way we hoped they would, but riders also recognized what was going on with each bike and appreciated it.