Are you sick of cleaning and repairing your bike over Autumn Winter and Spring months? Do you break chains and rear mech's?
The derailleur drivetrain was invented in 1928 and works perfectly fine for road bikes where precision shifting is not impaired by mud sand and more mud. A lot of design and engineering has gone into improving the rear derailleur, but this system is still exposed to the elements and mud.
The derailleur has become the mechanical Achilles heel when long distances and trail conditions turn bad.
Gearboxes have more long-term benefits for mountain biking than an exposed rear derailleur system.
Years of maintenance free cycling.
10000 quite belt-drive miles. At Olsen Bicycles, I have designed a frame around the Pinion gearbox based on UK hardtail geometry. With the Pinion gearbox and Gates Belt drive, this frame has both low maintenance and ride versatility.
With low-maintenance at the heart of the design lets break down some of the features:
- Elevated chainstays allow the frame design to use continuous runs of uni-directional (UD) carbon from the axles to the headtube.
- Elevated chainstays also gives the frame large tyre clearance around the chainstays and chainring.
- Symmetrical chainstays keeps the Carbon lay-up the same on both sides for strength and balance.
- Adjustable gearbox mounting plates that also tension the belt.
- Two different wheel sizes fitting both 29 x 2.4" and 27.5 x 3.0" (plus sized) tyres without affecting the handling.
- 27.5+ tyres give you the extra comfort braking control.
- 29er tyres give you the speed and roll over anything.
This gives you two bikes or more in one and can be built into several bike set-ups ride setup.
We have adopted established mountain bike standards:
- 142/12mm maxle dropouts
- SHIS 44mm headtube
- Internal gear cable and dropper post hose routing.
- 180mm Post mount disc brakes.
- Both Pinion gearboxes P-line or C-line.
So how do we make a frame more versatile and taylored to you? This frame uses the benefits of Carbon monocoque construction, However we have designed the frame to allow for some small changes to create a Semi-Customiseable Frame Geometry:
- We can change the Reach (top tube) from between 400 - 455mm.
- Head angle can be anything from 66 to 70 degrees.
- Bottom bracket drop can be changed by changing the mounting plates.
Long travel geometry:
- With a 66 or 68 degree slack head angle this frame can handle 120mm forks with 29er tyres or 140mm forks with 27.5" tyres.
- This makes the riding style aggressive and perfect for jumps, burms and table tops at Trail centres.
Rigid fork geometry:
- With 68 or 70 degree head angle this from feels balanced with 470mm Axle to Crown rigid fork.
- This make the bike ideal for bike packing and long distance cycling
In addition to this the bottom bracket drop can be changed.
- The Belt adjustment is done by using the tensioning fob to rotate the gearbox mounting plates.
- These plates can be changed and come in 2 sizes, standard and +5 if you prefer a lower bottom bracket.
- This gives you more options to make the frame suit your riding style.
If you have a lot of bikes, this bike will replace several frames in your collection.
If you only want one bike then look no further.
Whether you want a bike to train on or take you on an adventure This bike will not let you down.
Join the #greatbritishweather gearbox revolution where ever you are in the world it is raining somewhere...
Risks and challenges
I have a lot of manufacturing experience to make this project work. I was the designer at On-One and Planet-X for two years was responsible for designing 4 Carbon frames and getting them into production in China. I have been a product designer and an engineer for over 20 years and want to manufacture something locally in Britain.
I have local suppliers through Sussex that I can meet face to face if we encounter any problems. There may be some production delays with laser cutting and then CNC machining the frame inserts where there are 3 suppliers involved.
It will take approx 8 weeks to get the adjustment plates Laser cut and them CNC and anodised. However I aim to keep everyone informed.
I have a soft epoxy tool and aim to create a master pattern and a series of hard tools. I have been test riding and prototyping for over 6 months so understand the limitations of working with pre-preg carbon fibre.
Pinion Gearboxes have been extensively tested and developed in Germany. The P-Line has an established ride record. The C-Line is new for Q1 2017, however with their experience I do not expect any problems. Pinion have a 5 year warranty and extensive customer service support.
Gates Carbon Drive has over 10 years' experience making belts specifically for bicycles. Gates have an excellent reputation and excellent customer service.
There is nothing in this project that I have not tested or cannot solve.
Learn about accountability on Kickstarter