Is it worth relocating household goods from Bangkok to Geneva, and what are the best transport options?

If the bikes are high quality, ie: 1k$ and above, then yes. If they're just worth $2-300, each, it won't be worth the trouble. Note that the bike market is much larger in Europe than in south east Asia... This means more choice and better overall value.

Everything in Switzerland is expensive compare to other countries in Europe, even more if you compare to Thailand. So yea, ship everything. 🤣

I recommend you make a list of some essentials, then search on the internet to find the cost of buying them once you're there, looking at ecommerce sites and second hand selling sites such as local ebay, if it operates there, facebook marketplace, etc. Online is often the cheapest way to buy. If you can afford the up front cost of buying again there, then when you leave the country, you will get a little over half of that money back by selling it again second hand. You may get all your money back on anything bought second hand.

Also consider the complexities of international shipping and the distraction that will be, and that shipping can take months.

After doing that I haven't yet concluded that it is worthwhile. Instead I budget for some excess luggage. (You might be able to persuade your employer to buy tickets with an airline that gives you lots of luggage allowance.) With three people's allowances you'll be able to bring many treasured possessions, but for most airlines a bike would cost extra. But bikes are pretty cheap in Europe and widely available second hand, from budget bikes to extremely advanced bikes.

Huge congratulations on finding this opportunity!

I've relocated 5 times and my permanent residence is in the USA: 1. Move limited household items (furniture & bedroom stuff -- just what you need to create familiarity & comfort in the new place) You may find and want new HH items that can only be found in your 'new' location. Plan for some accumulation/collecting. 2. Ask for a relocation allowance from your employers and talk to your family about what they need/want/expect in a new adventure, have their realistic needs accommodated 3. Restructure your compensation package to account for expenses you would not incur if staying home -- travel, commutation, housing expenses. 4. Be sure school & education needs/requirements will be met. Good luck & embrace the adventure. 5. Network friends & contacts starting from home, make networking an on-going practice. JH

You definitely need a relocation package from your company. Moving your personal items are the least of your worries. You are moving to one of the most expensive countries in the world and will need help with finding accommodation, bank account, registering with authorities, doctors, schooling, driving license, language assistance, etc. If your company is not offering a relocation package then I you really question the opportunity.

If it's just a few years won't you face big import taxes by bringing these items back into Thailand on your return or are they granted exemption?

Bicycles you can check in for a fixed price for your flight .Get a surplus big box at a bicycle shop .safe journey

Honestly with the cost of sea freight exponentially high over the last few years I would seriously hesitate. Place like Geneva if it is only 2 years then rent furniture. Plenty of bikes to buy the second hand.

It's a huge cost. I have moved a container all around Asia, this is it's final resting place, never again.