Two-seater Viper FS 3.0 electric mountain bike: fit a passenger luggage rack on a full suspension aluminum mountain bike + improved mudguards
published: 17/05/21, 20:15
I found a few free hours to advance on my two-seater mountain bike on an electric Viper FS 3.0 base.
This is a used 2006 model ATV at a good price (the price of the new rear shock absorber! )
Finding a rear suspension MTB luggage rack is already complicated because the models are rare but the few existing models on the market do not withstand more than 10 or 15 kg ...There is therefore nothing on the market strong enough for an AR suspended mountain bike to transport a child weighing over 15 kg (and with the safety step certainly no more than 10 kg!)
So you have to innovate a little if you want to get by and make a two-seater mountain bike worthy of the name in order to transport your kid in the woods (see your girlfriend if she has reasonable "dimensions" )!
So act!
The viper FR 3.0 is a 7005 aluminum frame (US standard apparently: 7020 here): I am not equipped to weld aluminum and anyway from what I have just read the 7005 welds rather badly! So impossible to weld here unlike my Rockrider in good steel that I was able to weld and resolder (and not just a little) in all corners! See electric-transport / reinforce-the-fork-of-a-rockrider-6-0-convert-to-electric-and-discs-t16170.html
I adapted a static luggage rack given for a resistance of 140 kg on Amazon (so 60-70 kg in real life I presume) via the following modification in photos.
As this luggage rack (like all slightly beefy luggage racks) attaches to the seat post ... well, I mounted a second one on the swingarm. So much for the principle.
I went on a square tube for strength and pivot reasons. It is a profile of 25 * 20 therefore with a good thickness.
The 2 main raw iron elements:
Pointing and checking of dimensions:
Bolting:
Pointing of the reinforcement triangle:
The 6mm bolt was too light, I switch to 8mm:
It smells like the end:
The small 3D printed cap (there is one for the bottom too):
The seat:
I tested it (in static) at 52 kg (not taken a photo but I can on request). He's not moving!
My only fear is at the level of the resistance of the aluminum frame since where I set myself it is not at all a part which must undergo such an effort. I compensated by bolting "cylinder on cylinder" ... to see.
I also have a fear about the 4 aluminum tubes of the height adjustment luggage rack which are tightened with 1 single point of compression (steel on aluminum) ...
Short hold over time to monitor regularly!
I would probably make a video for lazy people who don't want to read a forum after a few weeks of use ... if nothing has broken by then (and even if it has broken!)!
This is a used 2006 model ATV at a good price (the price of the new rear shock absorber! )
Finding a rear suspension MTB luggage rack is already complicated because the models are rare but the few existing models on the market do not withstand more than 10 or 15 kg ...There is therefore nothing on the market strong enough for an AR suspended mountain bike to transport a child weighing over 15 kg (and with the safety step certainly no more than 10 kg!)
So you have to innovate a little if you want to get by and make a two-seater mountain bike worthy of the name in order to transport your kid in the woods (see your girlfriend if she has reasonable "dimensions" )!
So act!
The viper FR 3.0 is a 7005 aluminum frame (US standard apparently: 7020 here): I am not equipped to weld aluminum and anyway from what I have just read the 7005 welds rather badly! So impossible to weld here unlike my Rockrider in good steel that I was able to weld and resolder (and not just a little) in all corners! See electric-transport / reinforce-the-fork-of-a-rockrider-6-0-convert-to-electric-and-discs-t16170.html
I adapted a static luggage rack given for a resistance of 140 kg on Amazon (so 60-70 kg in real life I presume) via the following modification in photos.
As this luggage rack (like all slightly beefy luggage racks) attaches to the seat post ... well, I mounted a second one on the swingarm. So much for the principle.
I went on a square tube for strength and pivot reasons. It is a profile of 25 * 20 therefore with a good thickness.
The 2 main raw iron elements:
Pointing and checking of dimensions:
Bolting:
Pointing of the reinforcement triangle:
The 6mm bolt was too light, I switch to 8mm:
It smells like the end:
The small 3D printed cap (there is one for the bottom too):
The seat:
I tested it (in static) at 52 kg (not taken a photo but I can on request). He's not moving!
My only fear is at the level of the resistance of the aluminum frame since where I set myself it is not at all a part which must undergo such an effort. I compensated by bolting "cylinder on cylinder" ... to see.
I also have a fear about the 4 aluminum tubes of the height adjustment luggage rack which are tightened with 1 single point of compression (steel on aluminum) ...
Short hold over time to monitor regularly!
I would probably make a video for lazy people who don't want to read a forum after a few weeks of use ... if nothing has broken by then (and even if it has broken!)!