As per the weather in december, if you are OK with the chilled windy air and snow fall, you can probably go to Auli on a bike trip. But if you are not adventerous enough to handle the chilled wind and unpreditable snow fall, you can either opt HRTC bus or privte bus or by train whichever suits your budget. :) Happy Travelling
In December it is quite dangerous to bike trip especially on the snow. Even if there is snow on the Auli roads than no vechicle is allowed to go Auli. Then in this case you have to park it in Joshimath and use cable car to reach Auli which is the only option.
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