MINOURA Minimag M20-D Instruction Manual

Indoor Bicycle Trainer for mini-velo

– instructions manual –

Minoura Japan Headquarters Minoura North American Tech Center

(for all customers) (for U.S. residents only)

1197-1 Godo, Anpachi, Gifu 503-2305 Japan 1996 East Avenue, Hayward, CA 94541 U.S.A.

Phone: [phone] / Fax: [phone] Phone: [phone] / Fax: [phone]

Email: [e-mail] Email: [e-mail]

www.minoura.jp

Made in Japan

M20-D

Read this instructions carefully before use

(ver.1.2 2010/2)

Tire Capacity Size:

17 x 1-1/8" - 20 x 1-3/8"

IMPORTANT NOTICE

• For use with mini-velo or BMX with the tire sized between 17x1-1/8 and 20x1-3/8
only.

• Hub nut type rear wheel axle is not compatible with M20-D in standard.
You need to replace the left side coupling (UF-8) with optional "Left Side Coupling for
Hub Nut Axle".

• Some assembly required. Use correct tools (10mm spanner & M4 hex wrench).

Tools are not supplied in the kit.

• Use the supplied rear quick release skewer for maximum stability.
Minoura is not responsible for any problem caused from using your own skewer.

• Use on at and level oor or ground for your safety.

• Adjust the roller pressure to the rear tire properly in order to maximize your tire life.

Tire and roller contact will eventually wear both your tire and the trainer roller.

• M20-D is a tire drive model, so if you use M20-D with a knobby tire on BMX, a loud
noise must occur. To avoid this problem, replace the rear tire to a slick pattern one.

• Do not use M20-D for removing the mud from the tire.

• Adjusting the resistance must be done with the bike stopped. Do not operate the

adjustment lever (EM-13) while the rear wheel is spinning.

• Touching the spinning wheel and/or any other moving parts while training may cause
serious injury. Keep children and pets away from the trainer when in use.

• It is not possible to convert the non-remote resistance unit to the remote control

version one due to a difference in the inside mechanism.

• If you feel any strange noise or smell, stop using M20-D immediately and contact the

retailer where you purchased the M20-D.

• Any warranty will be void if you use M20-D for other purpose than instructed.
Minorua offers 1-year limited warranty on the resistance unit and 5-year limited
warranty on the frame from the date of your purchase for any problem caused by
manufacturer's defect.
Any damage or problem caused by transporting process is not covered under warranty.
Any damage from shipping or moving must be made to the shipping company.

- Page 2 -

BF-4: Leg Rubber Cover (Red) EM-1: Outer Cap

BF-6: Leg Rubber EM-2: Axle Holder

BF-8: M20 Main Frame (White) EM-3: Drive Roller & Bearing

UF-6: Right Side Coupling & Clamp Lever EM-4: Main Housing

UF-7: Clamp Lever Guide EM-5: Alloy Rotor

UF-8: Left Side Coupling (for Q/R skewer) EM-11: Connecting Plate

UF-9: Coupling Lock Ring (Red) EM-13: Resistance Adjust Lever

M5-2: Rubber Foot Cap (29mm) EM-17: Flywheel Disc (0.6 kgs)

MF-3: Roller Pressure Adjust Knob EM-19: Magnet Plate (for M20)

LM-10: Base Plate EM-20: Flywheel Cover (White for M20)

UF-9

UF-8

UF-6

UF-7

M5-2

BF-4

BF-6

BF-4

BF-6

MF-3

EM-1

EM-2

LM-10

EM-11

EM-3

EM-4

EM-5

EM-19

EM-17

EM-20

EM-13

BF-8

M20-D Schematics

- Page 3 -

3.

Fully open both legs and place M20-D on

a at and level oor. (see Fig. B)
At this moment, make sure all 4 foot are
contacting the oor at once to sit on the
oor stable.

How To Setup Your M20-D Trainer

2.

Install the Roller Pressure Adjust Knob set (MF-3)

to M20-D

frame

. (see Fig. A)

Insert the at washer and acorn spring into the

knob bolt rst, then screw the knob set to the

welded nut on the bracket.

- Page 4 -

1.

Replace your rear wheel quick release skewer to the supplied one.

Minoura guarantees the stability only when using the supplied skewer due to the coupling inner shape.

!

If your bike is not equipped with quick release skewer and it's a hub nut type,
replace the left side coupling (UF-8) to the optional "Left Side Coupling for Hub
Nut Axle".
Minoura doesn't guarantee the stability if you don't replace the left side coupling.

You don't need the supplied quick release skewer if your wheel is a hub nut type.
It's not possible to convert your wheel from the hub nut type to the quick release
skewer type unless replacing the hub.

!

Required Tools: 1 x 10mm Spanner
1 x M4 Hex Wrench

!

If you feel some difculty

of the vertical action of the
Mag resistance unit, slightly
loosen the pivot bolt which
connects the Mag unit to the
frame.
Do not over-loosen the pivot
bolt. It may cause injury to

your nger when you lift up

the trainer.

!

Make sure the acorn shaped
spring direction is as shown in
Fig. A.

Failure will cause difculty on

rotating.

(Fig. A)

(Fig. B)

4.

Place your rear wheel in between the couplings.

1)

Loosen the lock ring (UF-9) to allow the left

side coupling (UF-8) be free. (see Fig. C)

2)

Pull up the quick hub clamp lever (UF-6) to

retract the right side coupling. (see Fig. D)

3)

Insert the left side (quick lever side) skewer

into the left side coupling rst.

The quick lever shaft must be inserted into the

cut-out on the coupling to hold the bike stable.

Turn the coupling to adjust the cut-out position.

4)

While keeping this position, slowly come

down the bike to align the right side acorn nut

to the right side coupling.

(Fig. C)

(Fig. D)

(Fig. E)

(Fig. F)

5)

Push down the quick hub clamp lever to hold the rear wheel. (see Fig. E)

If you start feeling resistance when the lever comes at 4 o'clock position, it's correct.

If the clamping hub is too tight or too loose due to wrong position of the left side coupling, pull up the

lever to release the bike, adjust the left side coupling position and try clamping the hub again.

6)

Lastly, tighten the lock ring to x the left side coupling position. (see Fig. F)

Both left and right side couplings are
designed to suit the supplied quick release

skewer. The left side coupling must t

perfectly in the skewer head to get correct
stability. (see Fig. G)

Any skewer type which lever is located on
the end of the axle (Fig. H) or the lever will
not be bent over right angle (Fig. I) cannot
be used on M20-D.

!

(Fig. G)

(Fig. H)

(Fig. I)

!

Precisely adjust the left side coupling
position to keep the correct thightness of
rear hub clamping.
Too tight setting will cause damage to both
M20-D and your bike frame.
Too loose setting may cause the bike to
come out of the trainer during use.

- Page 5 -

6.

The rear tire should sit in the almost center part of
the Drive Roller without touching any other parts.
(see Fig. L)
If the tire has touched the plastic parts (Fig. M)
due to some reasons like the rear wheel is not trued
correctly or you have installed a too fat tire, you must
adjust the Mag unit position.

To do so, loosen the backside screws with M5 hex
wrench, adjust the roller position, then tighten the
screws again tightly. (see Fig. N)

5.

Contact the Drive Roller to the rear tire by turning the Roller Pressure Adjust Knob clockwise. (see Fig. J)

The best position is that the roller compresses the tire in the depth of 3 - 4 mm. (see Fig. K)

- Page 6 -

(Fig. L)

(Fig. N)(Fig. M)

(Fig. J)

(Fig. K)

Please note too much and too less roller pressure will bring premature tire wear.
Keep correct roller pressure and maintain the air pressure in correct level before
using M20-D.

!

If it's hard to tighten the knob bolt, lift up the Mag unit by hand then tighten the knob.

TIPS

How To Adjust Resistance Level

M20-D provides 3 different resistance levels to suit your

training level.

To Increase Resistance Level:

Slide the Dial Lever toward "H" position.

To Decrease Resistance Level:

Slide the Dial Lever toward "L" position.

!

If the rear tire has touched any other parts than the Drive Roller, the part may be
damaged and your tire will wear out quickly.

!

It is impossible to adjust the rear wheel position by adjusting the left side coupling
position. It just works to adjust the coupling distance.

5.

To remove the bike from M20-D, loosen the knob then lift up om the clamp.
If you remove the bike without changing the roller position, the next installation may become difcult
because the rear wheel has been pushed forward by the roller.

- Page 7 -