Two-seater Viper FS 3.0 electric mountain bike: fit a passenger luggage rack on a full suspension aluminum mountain bike + improved mudguards

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Two-seater Viper FS 3.0 electric mountain bike: fit a passenger luggage rack on a full suspension aluminum mountain bike + improved mudguards




by Christophe » 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! : Cheesy: ) : Cheesy:

Image

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" : Cheesy: )!

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.

Image

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:

VTT_biplace_0.jpg
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Pointing and checking of dimensions:

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Bolting:

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Pointing of the reinforcement triangle:

VTT_biplace_5.jpg
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The 6mm bolt was too light, I switch to 8mm:

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It smells like the end:

VTT_biplace_7.jpg


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The small 3D printed cap (there is one for the bottom too):

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The seat:

VTT_biplace_11.jpg
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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!)!
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Re: Viper FS 3.0 two-seater mountain bike: adapt a passenger luggage rack to a 7005 (7020) full suspension aluminum mountain bike?




by Macro » 18/05/21, 11:00

Christophe..You will have to go to a better welding process for this kind of work ... Certainly it does the job ... But with TIG welded parts you could make finer, more beautiful and just as strong. ..

And why two-seater? Is it that Minichristophe is not able to pedal himself?
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Re: Viper FS 3.0 two-seater mountain bike: adapt a passenger luggage rack to a 7005 (7020) full suspension aluminum mountain bike?




by Christophe » 18/05/21, 11:33

What is not beautiful? It's too big ? Do you want a slap? : Cheesy: : Cheesy:

I would apply a coat of paint and do some finishing or reinforcement if necessary after a few weeks of testing to validate the tests under load.

I have already thought of TIG but it costs an arm ... in gas (obviously all have gone to monthly subscription!)! I don't weld enough to make it interesting. Maybe one day I will equip myself when there will be no gas TIG ... like the cored wire. I don't know why it doesn't exist yet?

Because the flux-cored wire suits me very well: I weld 1 mm with it (the bolting tube is 1 mm)

Aluminum welding is a separate job, especially with special aluminum alloys.

This piece must weigh around 300 gr ... not enough to make a cheese out of it.

It's my emergency bike to bring MiniChris to school (14 km round trip) and take a few walks in the woods in "eco-friendly motocross" mode ... I haven't yet mounted his own electric bike. (I'm thinking about it) ! : Cheesy:
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Re: Viper FS 3.0 two-seater mountain bike: adapt a passenger luggage rack to a 7005 (7020) full suspension aluminum mountain bike?




by Christophe » 19/05/21, 12:14

Damn, I didn't show you a picture of the full Viper FS 3.0 actually ... so there you go, between two showers ...

viper_fs30_2.jpg


viper_fs30.jpg


Videos soon ...
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Re: Viper FS 3.0 two-seater mountain bike: adapt a passenger luggage rack to a 7005 (7020) full suspension aluminum mountain bike?




by GuyGadeboisTheBack » 19/05/21, 12:16

We look forward...
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Re: Viper FS 3.0 two-seater mountain bike: adapt a passenger luggage rack to a 7005 (7020) full suspension aluminum mountain bike?




by Christophe » 19/05/21, 12:24

Yes you have interest !!! : Mrgreen:

Because if this mountain bike exists it's a bit of your fault considering how you said that my rockrider 6.0 decathlon was daube (and it was justified but only before my modifications madmaxtestques : Cheesy: )!
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Re: Viper FS 3.0 two-seater mountain bike: adapt a passenger luggage rack to a 7005 (7020) full suspension aluminum mountain bike?




by GuyGadeboisTheBack » 19/05/21, 12:38

The wait is unbearable.
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"By definition the cause is the product of the effect" .... "There is absolutely nothing to do about the climate" .... "Nature is shit". (Exnihiloest, aka Blédina)
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Re: Viper FS 3.0 two-seater mountain bike: adapt a passenger luggage rack to a 7005 (7020) full suspension aluminum mountain bike?




by GuyGadeboisTheBack » 19/05/21, 12:41

Bah what, will there be someone on the bike or will he be radio guided ??? : Mrgreen:
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"It is better to mobilize your intelligence on bullshit than to mobilize your bullshit on smart things. The most serious disease of the brain is to think." (J. Rouxel)
"No ?" ©
"By definition the cause is the product of the effect" .... "There is absolutely nothing to do about the climate" .... "Nature is shit". (Exnihiloest, aka Blédina)


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