Minoura Japan – M20-D

M20-D Mini-Mag

Mini-Velo Magnetic trainer

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Minoura M-series for Mini-Velo

The M-series gives the largest range of models for tire drive trainers, offering a quality indoor bike training experience at a reasonable price. All models feature the stable U-shape frame with the quick release wheel/hub clamping system.

This model is specially designed to suit Mini-Velo bikes. These bikes are very popular in large cities, where large wheeled bikes cause space issues and therefore the smaller wheels from the Mini-Velo are a great solution. The frame has been changed to fit the smaller wheel sizing of Mini-Velo bikes, as well as the characteristics of the resistance unit.

Mini-Velo wheel sizing

This model is specially designed to suit Mini-Velo bikes. These bikes are very popular in large cities, where large wheeled bikes cause space issues and therefore the smaller wheels from the Mini-Velo are a great solution. They use wheel sizes ranging from 17x1.1/4, 18 or 20” wheels.

The M20-D Magnetic Resistance Unit

The M20-D has about 25% less resistance then other M-series models, to suit the smaller wheel.
There is an easy 3-step resistance levels via the Dial and the maximum power output is 370 Watt. There is also an accurately spin-balanced 600 gram flywheel, to assist the roller to retain a smooth rotation at all times.

The U-shape Frame

The M20’s frame design is the same design as the M-series frame, but a lower version. It uses 38mm steel tubing for the U-shape, which is durable enough to supply 100% support, for riders up to 120 kg in weight. The U-shape is supported by 29mm legs, which fold slightly outwards for a very stable platform. They also fold flat for best possible storage.
The paint finish of the frame is a multi-compound.

m20d-2_blank.jpgM20-D
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Special 18-20” Frame

Special design 18-20” Frame

he M20-D is an M-series model, specially designed for the very popular Mini-Velo bikes. The frame has been altered to suit all possible wheel sizes in the 18 and 20” sizing, as well as 17x1.1/4”.

The U-shape frame for Mini-Velo

The M20's frame design was built for strength and stability. It uses large 38mm steel tubing for the U-shape, which is durable enough to supply 100% support, for riders up to 120 kg in weight. The U-shape is supported by 29mm legs, which fold slightly outwards for a very stable platform. The legs also fold flat for best possible storage.

Resistance Technology

Minoura’s Magnetic “Eddy Current” benefits:

  • Quiet operation
  • Constant power output
  • Controllable resistance

We at Minoura have been the pioneers of magnetic resistance indoor trainers. In the 80’s, there were only two ways to generate resistance; Wind fan and Roller pressure.
The Fan type was very noisy, but with a reasonably exponential power curve, up to a certain speed, at which it would stop giving resistance.
The Roller pressure type had very fast wear and very unreliable resistance.


The Minoura patented system was a major breakthrough in regards to a quiet and smooth resistance system.
The basic principles of the “Eddy Current System” are simple. There are two magnets opposing each other, and an alloy disc is located between the magnets. The magnets pull or push each other, depending on their position versus each other. The alloy rotor between the magnets cut the magnetic fields, thus creating resistance. This is a very reliable resistance method, which does not alter the resistance when heating up during exercise.
Later resistance developments such as simple magnetic and fluid based systems still find it hard to cope with heat built-up in the resistance units, causing large variations in resistance. That is why Minoura has continued with the proven “Eddy Current” system.

The current versions of this unit have a similar design, but more refined and tuned for optimum performance.

Quick Release wheel clamping

All M-series models feature a convenient quick release type hub clamping system, allowing you to engage/release the bike very quickly. By moving the special lever up/down, the right side coupling slides in/out, fixing/releasing the wheel from the frame. This is a great time saver in setting up time, before/after your workout. After you secure the bicycle, you tighten the resistance unit against the tyre itself with a dial-knob.

Magnetic vs Fluid

If you want controlled resistance, Magnetic is the only choice

The Fluid system was originally developed by CycleOps. Its mechanism is quite simple.
A turbine with fins spins in a fluid, inside a chamber. This system generates resistance with the fan blades turning inside the fluid.

The problems start with a Fluid system needing a fully sealed housing to avoid fluid leakage. Secondly a fully sealed chamber causes additional problems with expansion of fluid/air when warming up, changing the characteristics of resistance badly. Continuous repeating of the heat built-up will cause sealing issues and the fluid will start to breakdown and change characteristics even more. Therefore a reliable resistance and troublesome usage for many years, is never possible with fluid.

Low Aerobic resistance

Trainers are traditionally used by riders wanting to build up muscles and increasing cardio. There are however also riders that are more worried about doing a little exercise, purely for a little cardio workout. For these riders it is more important to have a smooth quiet operation and easy operation and the M20-D model is perfect for this.

Specs

SKU
400-1775-00
Power Adjustability
3 levels (via manual lever)
Flywheel
Steel disc, 0.6 kgs
Usable Tire Size Range
17 x 1-1/4(ETRTO 32-369)– 20 x 1-1/8(ETRTO 28-451)
Both 406 and 451 compatible
Dimensions
W 580 x D 290 x H 300 mm
Leg Diameter = 29mm
Net Weight
5.3 kgs
Max Load
120 kgs (including bike weight)
Appendage
Instructions manual, Quick release skewer, Warranty policy card
Warranty Period
1 year

Cautions

Important Notice

  • Mag resistance unit may become HOT while workout. Do NOT touch it during and at least for 15 minutes after finishing session.
  • The rear wheel spins very fast and will cause serious injury if touch them. Keep children and pets away from trainer while using.
  • The maximum load of M20-D is 120 kgs including bike weight.
  • The couplings fit the supplied quick release skewer only. You cannot use your own skewer on Minoura trainer. You must replace the skewer before use.
  • Hub nut type bike should have fitting problem. The inner diameter on coupling is larger than the standard hub nut so we cannot guarantee the stability. Replace the left side coupling to the optional special one.
  • Any bike with internal transmission type hub cannot be used.
  • M20-D does NOT have the Foot-Step. It's the normal knob bolt style.
  • M20-D is NOT compatible with Watt-Master.

Options

Useful items for more comfortable training

Carry BagNew
Padded Nylon bag to put a trainer together with other stuff for easier transportationDoticon_grn_Right.png
Training Mat 2
A floor mat to protect the floor or carpet from scratch and stain, and reduces the vibration to the floor up to 75%Doticon_grn_Right.png
Training Mat Lite
A simpler floor mat to protect the floor and carpet from scratch and stain. No feature to reduce vibrationDoticon_grn_Right.png
Extra Pad Set
A set of 4 soft foamed PVC 100 x 100mm pads. Just put beneath the trainer legs to reduce the vibration to the floorDoticon_grn_Right.png
Mag Riser 3
A plastic front wheel leveler block to keep the bike position levelDoticon_grn_Right.png
Safe-T Net 2
100% cotton frame protection net catching salty sweat while trainingDoticon_grn_Right.png
Left Side Coupling Bolt
A replacement left side coupling for hub nut type bikeDoticon_grn_Right.png

Data Download

Jump to [Data Download] page Doticon_grn_Right.png