igus has recently presented the world’s first urban bike made from tribo-plastic as well as robust, light and maintenance-free motion plastics for the bicycle industry
Whether mountain bikes for outdoor use, record-breaking light racing bikes or ultra-robust e-cargo bikes: Treotham presents new igus components made of high-performance plastic as an alternative to metal solutions for the bikes of the future – including light and lubricant-free polymer plain bearings for mountain bikes, wear-resistant gears for e-bike motors and robust rod ends for e-cargo bikes.
In mounted rear-wheel suspensions of mountain bikes, many manufacturers traditionally rely on metallic ball or needle roller bearings. “However, lubrication-free plain bearings made of high-performance plastic prove to be more maintenance-friendly, up to 80 percent lighter and dirt-resistant,” says Alexander Welcker, Bicycle Industry Manager at igus. Treotham presents a new line of thick-walled plain bearings made of the igus iglidur M210 polymer. The new bearing type makes it possible to replace needle roller bearings in the rear wheel swing arms of mountain bikes quickly and without redesigning the shaft or frame. Minimal effort with big effect. “Lightweight plastic components reduce the load on the frame and can make the bicycle easier to manoeuvre.” Due to their higher flexibility, the bearings also have better vibration dampening than metallic bearing solutions, a specification that ensures better absorption of shocks and greater comfort for the rider.
New materials for suspension forks and pedals
Polymer bearings are also ideal for the bicycle industry for their dirt-resistance. The material components of the bearings are not applied in layers, but are mixed together homogeneously and as a result, there is no sliding film that can be worn away under loads, as is the case with traditional solutions with hard shells and soft coatings – for example, PTFE-coated plain bearings made of metal. But there is still improvements to be made. That’s why igus also developed the new iglidur SG03 series plain bearings with felt seals. These bearings provide additional protection against the ingress of dirt. “The felt seals are suitable for rough tolerances, where other seals may have problems. They also have a very low coefficient of friction,” says Welcker. “The new polymer bearings in the iglidur SG03 series are therefore ideally suited for use in, for example, bicycle pedals. There, they can ensure an increase in smooth running compared to metal bearings.” Another novelty being released in Frankfurt are the plastic plain bearings of the iglidur E series. igus has specifically developed these for use in suspension forks. The bearings are exceptionally suitable for linear movements in the guidance of the immersion tubes.
Tech up for bikes with tribo-gears and rod ends
The next innovation concerns the heart of e-bikes: the motor. igus has developed gears for planetary gearboxes made from high-performance plastic iglidur. “Tests in our in-house test laboratory show that iglidur gears significantly outperform other plastic alternatives in terms of service life,” emphasises Welcker. They are also quieter and lighter than metal solutions and in many cases, can be delivered faster. “Designers can design and commission the gears in just a few minutes using an online tool on the igus website. Production is carried out with 3D printers or by injection moulding – from one piece to high-volume production of several million.”
Treotham would also like to present a solution for cargo bikes, which are playing an increasingly important role in inner-city logistics traffic: igus metal-plastic rod ends of the igubal 2.0 series. Components that combine the advantages of stainless steel and plastic. A stainless steel housing and spherical ball in combination with an inner ring made of iglidur polymer ensure high stability and vibration dampening. “Combined with the advantages of being lubrication-free, maintenance-free and dirt-resistant, the hybrid rod ends are perfectly suited for the steering rods of cargo bikes,” says Welcker. igus also has developed a solution for the sliding doors of cargo boxes: flat guides of the drylin N series. “The sliding linear system consists of a rail and a guide carriage, is compact with an installation height of between 9 and 12mm and impresses with constant performance without rattling.”
igus:bike platform for bikes made of plastic
The vision of igus: introduce high-performance plastics instead of metal for use in more and more places on the bicycle. But where does this transformation end? There are no limits to the imagination, as evidenced by the igus:bike project, the concept of a bicycle that consists of over 90 percent plastic – from the frame and bearings up to the toothed belt. A high proportion of the required raw materials can be covered by recycling plastic waste. As a partner, the startup mtrl presents the first model. The Dutch company will start producing and selling the mtrl.bike by the end of this year.
