Like-minded people (and other stuff):

 

Online tutorial:

www.fahrtechnik.tv

 

Oliscout, the Bike Guide around Trier and in the Eifel:

http://www.trailtouren.de

 

The international initiative for mountainbiking

http://www.imba.com/

 

The german initiative for mountainbiking

http://www.dimb.de/

 

Site for mountainbiking in Luxembourg:

https://sites.google.com/site/bikerluenglish/

 

The national lobbying group for cycling in general:

http://www.lvi.lu/indexe.htm

 

The link about cycling and mountainbiking in Luxembourg from the National Tourist Office (ONT):

http://www.visitluxembourg.com/en/what-to-do/nature-tours/cycling-routes-and-mountain-bike-routes

 

Through this link, you can download all marked hiking and cycling tracks in Luxembourg: 

http://tourisme.geoportail.lu/?lang=en

 

Open Street Map for Luxembourg:

http://www.freizeitkarte-osm.de/garmin/de/luxemburg.html

 

Mountain-biking in the Ardennes:

http://www.ardennes-lux.lu/index.php?page=sport&id=2663&lan=fr&lieu=&types=

 

Some good guys doing a lot for mtbiking (MTB club in the Müllerthal):

http://vc-filano.lu

 

Hotels in Luxembourg that offer some facilities (like luggage transport) for cyclists in general:

http://www.bedandbike.lu/

 

Public transport in Luxembourg (cycles are accepted, generally for free):

http://www.mobiliteit.lu

 

Luxembourg's national cycle route network:

http://www.pch.public.lu/fr/pistes-cyclables/index.html

 

Sports and science (in relation to cycling)

http://sportsscientists.com/cycling/

 

My favorite bike shop in Luxembourg (Rédange/Attert and Lux.-city):

http://www.s-cape.lu/

 

Singletrail grading by difficulties:

http://www.singletrail-skala.de/overview

 

The best reference I could find on the net on first aid

http://85.25.34.248/bergmed/bergmed.php?section=5

 

A quite complete reference on what you would have to pack into your backpack for your transalp

http://www.mountainbike-transalp.at/index_125_125__1000000433_1_0__.html

 

Two refernces for mountainbiking in the very nice Saarland:

http://www.bikeaid.de/start

http://www.nmbiking.de/wp/

 

Wild animals / plants in the "Grande Région"

http://www.bio-gr.eu/en

 

Mountain-bike rental in Luxembourg

Test bikes by S-cape in Rédange (Specialized)

L.S. Sports

Rent-a-Bike Diekirch

Rent-a-Bike Müllerthal

Rent-a-Bike Ardennes

 

Tour operators abroad

Links to sites from people I know or where I got positive feedback from friends that took part in their events:

https://www.mtb-fahrtwind.de/de/mountainbike-reisen/home.html

http://www.trailxperience.com/

http://www.bergfuehlung.de/programm/mtb 

 

Marc Vaisse's MTB school (in the french Alpes de haute Provence)

http://www.wix.com/maclemak/ecole-vtt-blanche#!

 

The weather in Luxembourg

http://www.wetter.com/wetter_aktuell/wettervorhersage/7_tagesvorhersage/?id=LU0LU0006

http://www.ana.public.lu/fr/meteo/previsions/index.html (French)

 

Safer cycling

http://www.thebikestoragecompany.co.uk/bike-safety-guide/

http://www.rospa.com/road-safety/advice/pedal-cyclists/sharing-the-road-together-drivers-cyclists/

 

In case you like it wild and rough

http://www.bikepacking.com/