Tikit

Large Bike Friday tikit
Medium Bike Friday tikit (Folded)
Almost finished unfolding

The tikit is a 16-inch wheel folding bicycle with an unusually fast folding mechanism that can be folded/unfolded in less than five seconds. The tikit is manufactured in the USA by Bike Friday.

Specifications

The tikit is available in three sizes: small, medium, and large. The effective top tube for the three sizes is 50 cm (19.69 in) (small), 55 cm (21.65 in) (medium), and 60 cm (23.62 in) (large). The size-Large tikit is built with a slightly thicker tubing to support larger riders. The weight for the small and medium sizes is about 24 pounds (10.9 kg). The large size is about 25 pounds (11.3 kg). When folded, the size-Small tikit fits into a 15×24×35-inch (38×61×89 cm) space.

The stock tikit comes with an 8-speed SRAM rear cassette gear, in black or black/blue. Bike Friday also provides build-to-order versions, including 9-, 24-, and fixed 1-speed in a variety of colors.

Custom options are also available.[1]

Folding

The tikit folds in a unique manner.[2] A hard slap on the seatpost pushes it forward and disengages a pin held by spring steel connecting the seat mast to the rear of the bike. This enables the rear half of the tikit to rotate vertically under the bike. The seat post and handlebar stem then each fold down at slight angles to body.

A hole in an arm attached to the bottom bracket shell snaps onto a pin attached to the drive side of the lower seat tube (part of the main frame), locking the rear end in place. A pin attached to the side of the seatmast snaps into a hole in a piece attached to the non-drive side of the mainframe, locking it in place. Finally, a cap on the end of a screw attached to the stem slides into a slot on the drive side of the mainframe, securing it. This allows the bike to be picked up as one piece without unfolding and also allows the bike to wheel around by the front wheel, unlike the other Bike Fridays.

Unlike the Brompton or Birdy, this fold is not particularly compact; in fact, it is larger than many 20-and-16-inch (51 and 41 cm) wheel folding bicycles (such as those from Dahon). However, the tikit's claim to fame is the speed of the fold in its "Hyperfold" model. Here, the action of rotating the rear of the bike slackens an internal cable which enables the handlebar stem to be folded. As a result, no quick release clamps, latches, or locks are involved in the fold. This feature, unique among folding bicycles, enables the tikit to fold easily in under five seconds.

Model History

The tikit was introduced in 2007. Early versions of the tikit employed a pair of brake cables in the hyperfold mechanism. This mechanism permitted excessive flex in the handlebar stem when ridden.

In 2008 a new version of the tikit replaced the pair of brake cables with a single, and much thicker, cable, plus other improvements to the handlebar stem and to the rear seat pin assembly. The resulting bike is much stiffer. Bike Friday provides an upgrade path for 2007 tikits which provides some of the 2008 features, notably the new cable assembly.

In 2008 a second version of the tikit was introduced known as the "Model T", which sports a Brompton-style "twiddly knob" on the handlebar stem rather than the cable mechanism. This extends the folding time to about ten seconds. The "Model T" is $250 cheaper than the "Hyperfold" version.

In 2009, Bike Friday announced a safety recall for the Tikit. The "aardvark"—the portion of the seatmast which folds down on its hinge—had developed a stress crack in many instances due to weight from the rider. Bike Friday sent out a special brace which completed a triangle in the aardvark and strengthened it, and also replacement aardvarks in some cases. In late 2009 Bike Friday introduced a new, stronger one-piece aardvark with the bike's handle integrated into a curved bar, replacing the brace.

In 2010, Bike Friday announced a second safety recall[3] for the Tikit, this one having to do with the stem. Bike Friday is not the first company to have problems with a folding bicycle with a long stem. The long stem, a geometrically-required complement to the small wheels of a folding bicycle, is under considerable torque. Dahon Folding Bicycles also had a handlebar recall[4] in 2008.

References

  1. ↑ "commuter & tikits". Bike Friday. Retrieved 15 August 2014.
  2. ↑ "tikit FOLDING instruction video". YouTube. Retrieved 15 August 2014.
  3. ↑ second safety recall
  4. ↑ handlebar recall

External links

This article is issued from Wikipedia - version of the Monday, May 25, 2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.