HOMERDA2429-D／RDA2429-R 
29”MTB Rim-Driven Competition trainer
Specially for 29-inch MTB Tires and Disc Brake Specific Rims
This model is a further development of the RDA trainer.
The frame is extended to accept 29x2.5”tires and the rollers are re-shaped to make them fit most disc brake specific rims.
The standard RDA rim trainer requires at least 8mm vertical flat area on the rim sides, for contact with the rubber roller. With disc brake specific rims there is usually no flat anywhere, therefore the rubber rollers on the RDA2429 have been re-shaped to allow usage on most of these un-usually shaped rims.
For use with Off-Road tires
The RDA system (Rim Drive Action) is Minoura’s patented trainer system that drives the resistance unit via rubber rollers to the rim side wall, not the tire itself.
Because there is no tire contact, there is no tire wear/noise or vibrations caused by the tire tread pattern. This means MTB riders do not have to change tires or have a 2nd bike to do indoor training, just put your MTB bike on and off you go.
For the serious MTB racers it means you can warm up before a race, on your actual race bike set-up, just like road racers. That means less gear to take and easier for you to get ready for a race.
Road bikes and RDA trainers
There is one very good reason why road racers should use the RDA trainers. If you use the RDA for warming-up and cooling-down at a race event, you do not have to worry about wearing out your expensive racing tires.
That makes the RDA ideal for competitive road racers.
The RDA Magnetic Resistance Unit
The RDA unit was regulated at a medium 365 Watts of power. This is because a larger resistance would require a much stronger roller pressure at the rim end, which would cause much increased wear of the roller/rim.
There are 7 levels of resistance, controlled via the Remote or Dial lever. There is also an accurately 800 gram spin-balanced flywheel, to assist with a very smooth rotation at all times.
Compatible Tire Sizes
The RDA-2429 can be use on tire sizes from 24” to 29x2.5” tires.
The H-shape frame
The H-frame design is a further development of the U-frame. It offers a lighter weight and it will suit tires up to 29x2.5”.
It uses large 35mm lightweight steel tubing, which is durable enough to supply 100% support, for riders up to 120 kg in weight. The H-shape is supported by 29mm legs, which fold slightly outwards for a very stable platform. The legs also fold flat for best possible storage.
RDA2429-D (non-remote)
RDA2429-R (remote)
What's RDA (Rim Drive Action) designed for
Minoura's patented system for both MTB, BMX and road bikes
For use with Off-Road tires
The RDA system (Rim Drive Action) is Minoura’s patented trainer system that drives the resistance unit via rubber rollers to the rim side wall, not the tire itself.
The RDA2429 has modified rollers to suit most Disc Specific rims, but shapes that are a sharp “V” like, will not be able to be used, because the rollers will try to keep slipping up the V-shape, causing rim and roller wear with the constant slippage.
Rims with a slight vertical surface area will have no problem, unless they are damaged or have “out of roundness” issues.
Advantages of RDA
Because there is no tire contact, there is no tire wear/noise or vibrations caused by the tire tread pattern. This means MTB riders do not have to change tires or have a 2nd bike to do indoor training, just put your MTB bike on and off you go.
For the serious MTB racers it means you can warm up before a race, on your actual race bike set-up, just like road racers. That means less gear to take and easier for you to get ready for a race.
For Road racers there is one very good reason why road racers should use the RDA trainers. If you use the RDA for warming-up and cooling-down at a race event, you do not have to worry about wearing out your expensive racing tires.
That makes the RDA ideal for competitive road racers.
How does RDA work
RDA principle
The RDA system drives the resistance unit via 2 rubber rollers to the rim side wall. Both rollers have a quick release system for setting the roller on the rim.
Initially you need to set the height of the rollers, allowing for the rollers to touch a flat part of the rim, which is usually the brake pad surface.
One of the rollers drives the resistance unit, the other supports the rim on the other side, eliminating stress on the wheel.
Wheel installation
Installing the bike is easy. You fit the rear wheel between the wheel holders as usual. Then release the rollers on either side, in no particular way and you are ready.
RDA maintenance
There is no special maintenance. Because the roller drives the resistance run it via a belt, the belt will need replacement at some point of time, depending on usage and environment.
Compatible Tire Sizes
The RDA-2429 can be use on tire sizes from 24” to 29x2.5” tires.
Specs
RDA2429-D／RDA2429-R
SKU |
400-5960-00 (D) / 400-5970-00 (R)
|
|---|---|
Power Adjustability |
D = 7 levels via manual lever, R = 7 levels via remote shifter
|
Flywheel Weight |
0.8 kgs
|
Applicable Wheel Size |
24 – 29 inch
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Applicable Wheel Hub Width |
120 – 145 mm
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Dimensions |
W 650 x D 510 x H 410 mm
|
Net Weight |
7.6kg (D) / 7.8kg (R)
|
Max Load |
120 kgs (including bike weight)
|
Appendage |
Instructions manual, Special quick release skewer, Warranty policy card
|
Warranty Period |
1-year (Mag unit) / 5-year (frame)
|
Cautions
Important Notes
- This model is designed to be compatible with disc brake specialized rim, but it should not be perfect. We are testing on MAVIC rim.
- Do not touch any spinning wheel or parts to avoid injury. Keep children and pets away from the trainer while using.
- The coupling is designed to fit to the supplied quick release skewer only. We strongly recommend you to replace the skewer to the supplied one for your safety. Minoura is not responsible to any accident or damage caused by using your own skewer.
- Any hub with internal transmission system cannot be used.
- Hub nut type bike can be used on this trainer.
- You may feel some slippage when you pedal strongly. It's normal thing on rim drive trainer.
Options
Useful items for more comfortable training
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% 
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|---|---|
Training Mat Lite |
A simpler floor mat to protect the floor and carpet from scratch and stain. No feature to reduce vibration
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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 floor
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Mag Riser 3 |
A plastic front wheel leveler block to keep the bike position level
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Safe-T Net 2 |
100% cotton frame protection net catching salty sweat while training
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Data Download
Jump to [Data Download] page
Rim Dimension
I'm using a disc brake specialized rim. Can I use it on RDA?
No, except the latest RDA2429.
Our standard rim drive system found on RDA80 or older models requires certain vertical space on the rim side wall for contacting the rubber rollers.
The standard rim for caliper brake is no problem, but some of the disc brake specialized rim (such as Mavic CrossMax Disc) don't have enough space so it is impossible to use RDA.
RDA requires at least 8mm vertical space on the rim side wall.
Slipping Feeling
I feel something slipping when pedaling
On tire drive trainers, the drive roller is pushed hard against the tire, so there is a very solid connection. With the spring loaded rollers from the RDA, the rollers will move around a little on the rim with all the pedalling going on, especially with less smooth riders. This will feel like your tire is slipping a little, but do not worry, it is not a problem for the trainer or rim.
If you feel this is an issue, please try to pedal smoother.
Noise Level
My RDA is louder than tire drive trainer
The biggest concern among trainer users is if it's "quiet" or not.
Actually, RDA touches the flat rim side wall only so it should be quiet technically, but RDA has much more complicated mechanism than stationary tire drive system. Especially RDA is driven via V-belt, it causes another noise while using.
It was true in the past (when the production technique of tire drive system was poor) that RDA was quieter than tire drive, but nowadays the tire drive system has been so sophisticated that it becomes much quieter than RDA.