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OPEN BELT DRIVE Electric Mountainboards

 

One Board - Five set-ups!

Thanks to the amazing design behind the Open Belt Drive’s Motor Mounting panels,it’s possible to fit five different sized pulleys - meaning its possible to attach any wheels, from the amazingly grippy 9” Mud pluggers, down to 90mm STICKIES Longboard wheels.

Open Belt Drive 33/37T - 83/90mm STICKIES LONGBOARD WHEELS
The ultimate street cruiser? A mountainboard with longboard wheels might seem like a silly concept on paper - but the hybrid feel of having the control of a mountainboard mixed with the responsiveness & performance of STICKIES Longboard Wheels is something really quite special! 
Uses 33 or 37 tooth Slave Pulleys & 305 x 15mm STRONGBELTS

Open Belt Drive 44T - GUMMIES WHEELS
A street-racing mountainboard with high-quality Supersoft Urethane Longboard tyres, that’ll allow the tightest turns and most insane carves possible. Being 125mm in Diametre GUMMIES will glide over cracks & rocks that would stop smaller wheels. 
Uses 44 tooth Slave Pulley & 350 x 15mm STRONGBELTS

Open Belt Drive 62T - 6-7” WHEELS
For those who like some ‘light’ offroading, and don’t want to worry about ANY board-stopping imperfection in the street. 6.5 - 7” Tyres can handle your average offroad paths & tracks no problem, while being the comfiest tyres around for cruising along the streets. 
Uses 62 tooth Slave Pulley & 400 x 15mm STRONGBELTS 

Open Belt Drive 66T - 8” WHEELS
The ‘Industry Standard’ as far as wheel size goes, 8” tyres make this board fit for many applications! With a 66T Slave pulley that gives performance favouring eye-watering top speeds over acceleration, we’d compare this board to a Moto-Enduro Bike!
Uses 66 tooth Slave Pulley & 415 x 20mm STRONGBELTS 

Open Belt Drive 76T - 9” WHEELS
The Ultimate Offroad Machine! With 9” Tyres for flying over/up and terrain or hill its flying toward - this board cannot be stopped! With a 76 tooth Slave Pulley giving a gear ratio of 5.43:1 - the finished board has an amazing level of torque (similar to the Spur Gear Drive), and performance favouring insane acceleration over overall top speed.
Uses 76 tooth Slave Pulley & 460 x 20mm STRONGBELTS 


The OPEN BELT DRIVE (OBD) Electric Mountainboard is the latest drive system to be introduced to TRAMPA’s amazing product range.

Replacing the outgoing Original URBAN Mountainboard BELT DRIVE System, (which was kind of a universal part, & a bit of a one size fits all), the precision made Open Belt Drive Motor Mount is 'CNC’d from a solid block of Premium Heat-Treated T6 Aluminum' & uses a simple but very strong slide on into position Truck connector with Integrated Motor Mount Clamp. Unlike the Original Urban Belt Drive system is very easy to fit & assemble, uses 20mm Belts gaining more Traction & Torque from the motor Pulley & comes fitted with a 23mm wide Belt Tensioner as standard.

The OBD Clamp tightens with just 1x M6x25 Socket Cap Head Bolt as it securely interconnects with the precision made CNC ATB Trucks it is designed to fit onto! Awesome!

Also CNC’d from Premium Aluminum is the Motor Adaptor plate which snugly fits into the Motor Mount Panel. The Motor Adaptor Plate can be moved/positioned easily by tightening/loosening an M4x20mm Socket-capped bolt, allowing precision belt tensioning on the fly.

The OPEN BELT DRIVE is available in two models (66 tooth for 8 inch wheels & 76 tooth for 9 inch wheels) each has been designed to fit different wheel sizes with different pulleys, which then can be adjusted by changing the Motor Pulley, to give different gear ratios for different kinds of rides & size of rider, to give different performances in different setups... This Board offers many different performance options its quite wonderful :-)

OBD 66T uses the 66 tooth Slave Pulley with a gear ratio of 4.71:1 - giving a Mega high top speed of 36mph - Performance favouring eye-watering top speeds over acceleration. The OBD 66T systems can use 8 or 9 inch Wheels whilst fitting a 66 Tooth Slave Pulley to the 9 inch Wheel will decrease your torque & in potentially in hot climates, if driven at high speed or up steep hills for prolonged periods may cause you board to get too warm to operate & close down until cool.

OBD 76T uses the 76 tooth Slave Pulley with a gear ratio of 5.43:1 - giving an amazing level of torque (similar to the Spur Gear Drive), and performance favouring insane acceleration over overall top speed. Due to clearance, OBD 76T Systems can only use 9 inch Wheels. 

Designed to be AS SIMPLE AS POSSIBLE - these drive systems truly are a DIY-er’s dream.

Its possible to fit 8 inch tyres onto the 9 inch Hubs but the 9 inch tyres are too big to fit onto 8 inch hubs. When using 8 inch tyres you should use the 66 Tooth Slave pulley.
When fitting 8 inch tyres onto the 9 inch hubs, doing so changes the inflation profile of the 8 inch tyre as the 9 inch hubs are a 1/2 inch wider than the 8 inch hubs... 
Using 9 inch wheels on the rear of your deck add's a bit of extra weight but also gives you lots of extra grip allowing you to get the power put down onto the ground in harsh conditions.
We use a slightly larger Motor Mount & a 76 Tooth Slave Pulley in order to give the correct fit & harmonious gearing when using 9 inch Wheels on the rear supplying almost identical Gearing & performance as the Spur Gear Drive.
It is possible to use 8 or 9 inch tyres on the 76 Tooth Slave pulley, Using 8inch/76tooth will give you the highest Torque we offer on any board, (Which would drastically reduce your top speed too) whilst fitting a 66 Tooth Slave Pulley to the 9 inch Wheel will decrease your torque & in potentially in hot climates, if driven at high speed or up steep hills  for prolonged periods may cause you board to get too warm to operate & close down until cool.

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