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Step through folding bikes and an improved seatpost/floor pump

Commuter, Utility / Cargo Bike 3 2132

Show season for the bike industry is right around the corner, with Eurobike 2012 kicking off at the end of this month.  One new design that will debut at the show is the ultra low-step frame “Swoop” from Tern. According to the company, “The Swoop top tube is only 28 cm (11″) off the ground, making it one of the lowest step bikes on the market.”

Many people see step though frame designs and immediately think of them as women’s bikes. While it is true that these types of frames work well for women wearing skirts or dresses, there are other types of riders who can also benefit; multimodal commuters who need to get on and off the bike often (especially in work clothes), and older people with less flexibility for example. Tern also mentions that the lower center of gravity enhances stability, which is a plus for inexperienced cyclists who feel more comfortable being able to put both feet on the ground when necessary.

A related product that you will be able to see at Eurobike is the BioLogic PostPump 2.0, which will be standard equipment on many of the new Tern bikes. Unlike the combination seatposts/minipumps that were popular in the late 80s and early 90s (back when all mountain bikes had quick release seatpost binders), this product takes advantage of the very long seatpost found on folding bikes and functions as a high capacity floor pump. It has a flip out stand so that the user can secure it with a foot while pumping and makes use of the saddle as a handle. DL Byron from Bike Hugger, who travels with folding bikes fairly often, described the following usage context in a comment on a Google + post by Richard Masoner:

“Folding bike while traveling, arrive in hotel, assemble bike, you deflated the tires for extra room in the travel case, use seat post instead of another pump, can’t fly with Co2.

This pump is about convenience and utility for a folding bike. It’s not intended to replace another bike pump on a regular bike. It works because the seat mast is so big and can push volume into the tires.”

That makes sense to me, and I do think this is a good idea for folding bikes. No wonder the design won a 2012 red dot product design award. Read more about the PostPump 2.0 at Cyclelicious.

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  1. Nick F August 19, 2012 at 9:14 pm -  Reply

    I’ve always felt that the ultra-low step through is a strange feature to add on a bike, pushed on to consumers who don’t know what they really want by designers who are just looking for something on the frame to play with.

    Indeed, having an 280mm step-through is somewhat illogical. Unless the crank arms on the bike are 140mm long (pretty unlikely, considering the terrible, egg-beater-clown-bike ride that would produce), the rider of the bike is going to have to bend their knee more when simply going through a full crank rotation than when stepping over the bike frame. Guessing that the crank arms are instead 165mm, this means that you’d be raising your leg a full 50mm (2″) more when pedaling than when getting on the bike. If you are so inflexible (due to physiology or attire) that you need a bike with a 280mm step-through to get on board, you’re going to ruin something once in the saddle.

    Granted, there’s a slight benefit when dismounting, but having ridden some ultra-low step through frames, I feel like the step-through-swoop is frequently too small to properly fit a shoe through reliably, and you end up raising your leg higher than the chainring anyway.

    Having a step-through on a frame is a fantastic way to improve the ride experience, especially in the city. It just doesn’t need to be so low.

  2. robert July 7, 2015 at 6:14 am -  Reply

    well I like more the step through frame design than the classical male frame design… Im referring to the bast majority of frames… that have the top tube really at the top… they should be eliminated

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