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CYCLE SPORTS: August 2016
GT-Roller Q1.1

The four-cylinder bicycle roller, which is easy for anybody to ride, allows for standing pedaling, and is as close as you can get to actually riding. How can you make a three-cylinder bicycle roller easy for anybody to ride, while making the feeling of riding closer to actually riding? The clue to answering this question is to use two front cylinders.

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LUMINA: July 2016
GT-Roller Q1.1

The product is built excellently down to the details.

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BICYCLE21: July 2016
GT-Roller Q1.1

Rid yourself of the stress of three-cylinder bicycle rollers and enjoy yourself while increasing your skills Complete impressions of the first-ever four-cylinder bicycle roller not just in Japan, but in the world.

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CYCLE SPORTS: July 2016
GT-Roller Q1.1

Q1.1, the brand new four-cylinder bicycle roller with two cylinders for the front wheel, is equipped with a unique feature called the "Freedom System" which eliminates the unstable handling of existing three-cylinder bicycle rollers.

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BICYCLE21: February 2016
GT-Roller FREEDOM

The magical four-cylinder bicycle roller with unimaginable ease of riding and handling as if you are actually riding.

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CYCLE SPORTS: October 2015
GT-Roller Flex3

When I first used GROWTAC's GT-Roller Flex, I felt in my flesh that "I will not be able to use anything else"

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CYCLE SPORTS: August 2015
GT-Roller Flex2

The developer GROWTAC is a company that develops practical parts full of innovation.

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BICYCLE21: February 2015
GT-Roller Flex2

Feel a high sense of togetherness with you bicycle.

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BICYCLE21: January 2015
GT-Roller Flex2

A bicycle trainer that allows you to practice as if you are actually riding, as the roll center adjusts optimally to your pedaling method, center of gravity, and weight.

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BICYCLE21: November 2014
GT-Roller Flex2

A bicycle trainer that was created with the aim of allowing you to practice in a wide variety of ways, from pedaling while balancing yourself to feeling like you are actually riding outside.

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CYCLE SPORTS: August 2014
GT-Roller Flex2

"The revolutionary of the bicycle roller world" that has further increased its completeness.

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CYCLE SPORTS: June 2014
GT-Roller Flex2

Bicycle rollers have a reputation of safety and compact size. How has it evolved recently? How can it be enjoyed?

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BICYCLE CLUB: February 2014
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We wanted to reliably remove the vibration of bicycle trainers.
We spoke with GROWTAC's Masayuki Kimura, who studied the characteristics and reasons behind the sounds of bicycle trainers and developed a product that reliably removes them.

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ROAD BIKE CUSTOMIZE: 2013
When you visit GROWTAC's home page, the introduction contains the line "service that fits just right in the gap." This is everything for GROWTAC.

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BICYCLE CLUB: October 2013
GT-Roller Flex

Become a master of standing pedaling with this brand new bicycle roller!
Not only does this bicycle roller use your legs, your heart, and your lungs, it uses your body senses.

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CYCLOPOLIS Vol4: August 2013
GT-Roller Flex

Usages of bicycle rollers, which are perfect for the busy modern-day human, along with new ideas and gadget impressions of a new axis "from the bicycle roller with love"

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CYCLE SPORTS: August 2013
GT-Roller Flex

Even when pedaling seated, people slightly shift their weight from left to right as they ride, so through realizing this slight movement, we aimed to capture the same feeling as actually riding.

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CYCLE SPORTS: February 2013
GT-OIL

Perfect for hardcore users and long riders who ride even in the rain, using wet lubricants.

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FUNRIDE: June 2008
The roots of the representative bicycle man, Masayuki Kimura, who rides 2,000 km every month and commutes by bicycle only have been revealed.

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