It’s bonn ligthe. Thanks to the Bicycle Lexicon I could also tell you how to say it in 22 other languages. Or, if the non-Roman script was a problem, I could point to a pretty picture.
The Bicycle Lexicon was the work of the European Economic and Social Committee and has 23 language terms not just for mudguards, rims and suspension forks, but also cycling infrastructure, and terms useful for bicycle tours.
Fietscompartiment is Dutch for a train bicycle carriage, for instance. And, fret not, should you shred your skin-shorts in Finland you merely have to ask for pyöräilyhousut.
The Bicycle Lexicon is a free download and has been placed on Issuu.com. Got an Android phone? Download the Issuu Mobile app and you could have the Bicycle Lexicon on your person for your next world tour. Issuu Mobile is also coming to an iPhone and iPad touch soon.