Tranzbag makes 'pro' that it says fits mtb, and a 'road' that it says fits only road/gravel bikes. Has anyone tried to squeeze a mtb into the road bag, which is much narrower (hence lighter/smaller when packed, hence preferred if possible).

https://www.tranzbag.com/products/tranzbag-pro/

https://www.tranzbag.com/products/tranzbag-road/

Thanks

I have a road Tranzbag and my 52 cm frame road bike barely fits in it, I have to drop the saddle to be able to close the zipper (so I don't normally bother to do it). My MTB (hardtail with 27.5" tires) certainly wouldn't fit in the road bag. MTBs take up a lot more volume, hence they require a larger bag.

the frame on a MTb could fit, but the handlebar on an MTB is much wider then
on a road bike, the wheelset needs more space as well.

Last 2 years I used the large tranzbag for my downhill bike. The seat is normally down, so no prob. The only thing I did was removing the handlebars.

I learned a trick from other tranzbag users: leave the wheels on your bike and roll it, put the bag from the top once you're in train. The bag is large enough to cover it with both wheels mounted, including the downhill fork. It's easier to leave the wheels mounted and put it the bag once you're in the train if you have to pedal to the train station and change trains. The bag is not made to carry the bike on your shoulder more than a few meters.

Last summer I've found ticket controllers are more worried about bikes with mud or bikes obstructing aisles. If my bike has the wheels mounted but covered with the bag and well secured with the belts to the train, they don't mind.