San Marcos Frame Set
The San Marcos is a "sport touring" road frame designed by Grant Petersen of Rivendell. It is a fine ride on black top and smooth fire roads. While not designed for loaded touring, it can probably handle that type of duty even better than the Double Cross, which was Soma's go-to choice for touring before the Saga was designed.
- Tange Prestige heated treated CrMo steel with genuine Rivendell lugs
- Rivendell-designed road geometry
- Includes a lugged crown Tange Infinity CrMo steel fork (1" threaded steerer)
- Rack and fender eyelets
- Headtube pump peg
- Kickstand plate
- 1" size headtube
- 27.2mm seatpost size
- Sizes: 47, 51, 54, 59, 63cm
The 47 and 51cm are designed for 650b wheels and 55-75mm reach road brakes. Max. tire fit: 38mm
Changed for 2013: The 54 thru 63cm are designed for 700c wheels and 55-75mm reach road brakes. Max. tire fit: 35mm
The 59 and 63cm have that Rivendell double top tube to restore the triangulation lost with the tall top tube.
San Marcos Frame Set
Why I should or should not have a San Marcos in my life?
Without getting into your own person issues, this flyer offers insights from designer Grant Petersen on why he designed the San Marcos the way he did. Download flyer
Give me specifications on the San Marcos not listed on the Info tab.
Front derailleur required: Bottom pull, 28.6mm
650b fork: 52mm rake, 367mm axle-to-crown
700c fork: 45mm rake, 379mm axle-to-crown
Bottom bracket shell: 68mm, English thread
Hub spacing: 130mm
Braze ons: Upper bosses and dropout eyelets for rear rack, fender eyelets on fork, pump peg, downtube shifter bosses, two sets of H2O cage bosses Top tube cable routing: 10 o'clock position
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San Marcos Frame Set
Comfortable San Marcos
It took me a long time to spend this much on a bike... some years ago I decided to get a pretty nice aluminum touring bike for club rides and later a newish aluminum cyclocross to commute on. I was so wrong.....My first ride on the San Marcos was sooo quiet.. not used to a ride that makes so little noise and the drivetrain was so solid it felt like a fixe. But the main thing I have noticed is that the San Marcos is actually faster on the club rides because it is so comfortable to climb with or push hard on flats. I would have never thought such a beautiful vintage- looking bike would be so sleek. If you're looking... don't cheap out like I did..go for it.
Alan , , PA
Clydesdale's take on his 63cm San Marcos
I like it. I have not ridden as much as I would have liked because I have been on the "fast" bike but I have taken it out for a few 40K + rides and many smaller ones. Very comfortable with lots of spring due to the tubing size but not a lot of flex - so get the benefits of comfort of small tubed steel without noodliness (sic). I'm a clyde and it is very appropriate for all-rounder - better for my actual application than a cross bike. The bike is everything I hoped my Cross-Check would be (and was not). Nimble, fast, light, and versatile.
San Marcos Frame Set
Bicycle Times Reviews the San Marcos (63cm size)
I’ve been a Soma Fabrications owner for a few years—I have a Double Cross DC that has thousands of commuting miles on it—so I was eager to ride something new from a company that specializes in versatile, tough, and long-lasting frames and accessories.
This bike is Soma’s love child with Rivendell, meaning it was designed for Soma as a “sport touring bike” by Rivendell’s Grant Petersen, using Rivendell lugs, geometry, and design details. The San Marcos is “the bike any road rider who doesn’t race but rides mainly on the road ought to be riding,” according to Petersen.
So what are these design details? Well, it’s mainly about handlebar height and retro geometry to increase comfort. The concept is simple and time-tested: raise the handlebars to get weight off your hands, crane your neck less, and relieve stress on your lower back. The San Marcos’ top tube slopes up about 6o, raising the stem’s exit point from the head tube. The bike’s 1-inch threaded fork uses a quill stem that you can easily raise or lower to get the perfect height.
In addition to this main point of Rivendell geometry, you also get some bonuses to versatility that are on par with other Soma models. On the functional side, the bike will accommodate up to a 37mm-wide tire, or 32mm with fenders. The frame sports a pump peg on the head tube and two sets of water-bottle bosses. There are two sets of eyelets in the back for a rack and fenders, but only one set on the fork, meaning no front rack. Soma says light loads are fine, but this isn’t meant as a heavy touring bike.
The San Marcos uses the same steel lugs, bottom bracket shell, and fork crown that other Rivendell bikes do. The frame is made of high-quality Tange Prestige heat-treated, chromoly steel tubes, same as other Soma bikes. What you don’t get are the even higher-end steel and the fancier two-tone paint job of more expensive Rivendell bikes.
The two largest sizes have a double top tube. Since Petersen prefers the classic look of small-diameter tubes and lugs, an extra top tube was added on the 59cm and 63cm frames to maintain the same level of triangulation and stiffness as the smaller sizes, especially in the front end. This design has become one of his trademarks.
I believe bikes have personalities and those personalities are part of the buying decision. Jim Porter of Merry Sales (Soma’s distributor) says their relationship with Rivendell is like the relationship of Elvis to blues or gospel music. Taking his analogy further: if Rivendell is gospel, then Soma is Elvis being played in an old Cadillac.
The San Marcos gets you where you want to go in comfort and style, but it’s not going to be the most racy thing to ride. My test bike was built with 32mm-wide tires and had an incredibly smooth ride, but no tail fins (they aren’t very functional). Rough roads and smooth gravel were less of an issue for sure, as long as you’re not in a hurry.
Riding tall with those high handlebars meant the compact drops are probably at the height of most riders’ brake hoods. This provided several comfortable hand positions. The frame is both tall (in the top tube) and low (in the bottom bracket), which helped make for a very stable ride that carved turns gracefully.
The extra tube certainly seemed to help with front-end stiffness, as intended. I’m not that light, or that slow, but I never detected any lateral flex standing on steep climbs, or front shimmying on fast descents. For those of us used to more modern geometry, the extra top tube looks like overkill. I wouldn’t be surprised to see it on a bike intended for heavy touring. But it’s actually a retro solution to preserve frame integrity.
The San Marcos is definitely a comfort road bike that many people could get into as a versatile commuter, or a bike able to cart a light load, or just for getting out on long rides. In terms of goals and execution, I think Soma Fabrications has a winner. The San Marcos looks good and does everything it was meant to. It’s comfortable and versatile, but an inexpensive Rivendell is an expensive Soma. If you’re down with the retro styling and geometry, I’m certain this would provide years of comfortable service and enjoyment.