• Welcome Guest! If you are already a member of the BMW MOA, please log in to the forum in the upper right hand corner of this page. Check "Remember Me?" if you wish to stay logged in.

    We hope you enjoy the excellent technical knowledge, event information and discussions that the BMWMOA forum provides. Why not take the time to join the club, so you can enjoy posting on the forum, the club magazine, and all of the discounts and benefits the BMWMOA offers?

    Want to read the MOA monthly magazine for free? Take a 3-month test ride of the magazine; check here for details.

  • NOTE. Some content will be hidden from you. If you want to view all content, you must register for the forum if you are not a member, or if a member, you must be logged in.

R18 Classic Tank Upgrades


New member
Hi all,

Been looking at the R18 for a while, but have a couple of points that are holding me up. I love the aesthetics and features the R18 Classic provides without breaking the bank. I'm bummed about the small tank size compared to the B/Transcontinental, but don't want a 10k price jump for another two gallons.

With the models sharing the same frame, I'm thinking about getting a tank from a Transcontinental and bolting it on to the Classic. Has anyone attempted to change out the tanks or know someone who has?
The fairing bikes have a slightly different frame. The difference is right around where the tank sits and forward. The frame on the faired bikes is reinforced there and since the steering geometry is different, the length and angles near the headstock are quite different.

The net result is the area the tank mounts is a bit longer on the faired bikes. If the extra capacity is in the length, it would be unlikely to fit on the R18 Classic due to interference around headstock.

I’m getting an R18 Classic this spring. I’m not worried about fuel capacity though. 2 of my BMWs have similar capacity and I’m typically wanting a stretch or bio break before the tank is dry. One of them, my S1000R gets much worse MPG than the R18, so the range is even smaller. My GSA has nearly 9 gallons, but it’s more a case of refilling every other or third stop.

In reality unless I was riding mostly in some parts of the western US where fuel availability gaps could be 200 miles or more, it’s not an issue. Worst case if I was riding there, I could add a spare fuel container in a saddlebag for that stretch. But in the vast majority of riding the range won’t be an issue.