This top tube bag will attach to nearly any bicycle: road, mountain, urban, tandem, recumbent, gravel grinder or cross. This model is just a tiny bit smaller than the popular Medium Century Bag (by about ½"). *** Warnings: 1) Some cyclists do not like having a bag on the top tube as it may interfere with their knees while standing up to pedal. 2) We have had isolated reports of paint rubbing off caused from the straps or fabric on this bag. You may want to apply a piece of clear frame protection film or so-called “helicopter” tape to your top tube. *** Specifications: Weight: 73 g (2.6 oz.), Volume: 630 ml (38 cu in), Inside Dimensions (bottom of the bag): 10h x15w x 4.5d cm (3.9h x 5.9w x1.75d"), Outside Dimensions: 11.0h x 15.5w x 4.7d cm (4.3h x 6.1w x 1.85d"). Fits a top tube with a circumference up to 18cm (7").