I'd like to rent a bike while in Amsterdam to do a little trip. Is there a bike rental, which rents decent sport bikes? It seems like most rentals are aimed at renting city bikes, which I do not prefer. I only found one rental renting road bikes, but the price was in the area of 70+ euro per day, which seems ridiculous.
70 Euro's per day is indeed ridiculous. It is however not uncommon to demand a large deposit. So could it be that the 70 euro is to cover the deposit?
It will be difficult to find a sport bike. The surroundings of Amsterdam are really flat, so you only would need a sport bike if you go for speed. When renting a bike, you could ask a city bike with gears. It is not uncommon for city bikes in the Netherlands to have at least 3 gears.
A good renting spot for bicycles are the train stations of the Dutch rail ways. Their website is Dutch only which shows that they typically don't aim for a audience of tourists. Which doesn't mean that you can't rent a bike there as a tourist. Their prices are however quite affordable:
Om een fiets te huren, heeft u een geldig legitimatiebewijs nodig. U betaalt een borg variërend van € 50,- (voor de eenvoudigste fiets) tot € 145,- (voor een tandem). Een merkfiets zonder versnellingen met terugtraprem kost circa € 7,50 tot € 15,- per dag. Dit bedrag is inclusief verzekering tegen diefstal. Vaak is het ook mogelijk om een toerfiets met versnellingen, een tandemfiets of een elektrische fiets te huren.
Which translates to:
You'll need formal identification to rent a bike. A deposit ranging from 50 (for the simplest bike, to 145 (for a tandem) is required. A bike from a known brand without gear costs between 7,50 and 15,00. This includes theft insurance. It is also possible to rent a tourbike with gear, a tandem of an electric bicycle.
There are a few train stations in Amsterdam, which offer rental bikes. Amsterdam Central is included, however I would advice to go to a less central station (e.g. Amsterdam Amstel), to avoid the crowds a bit.
The bicycles from the train stations are quite decent. In know people who traveled >200 km in one day on such a rental.
If you don't really like the "grandma" type of bike, and a racing bike seems a bit too expensive for your needs, you can also try to rent a hybrid tour bike. For example, I found one at MacBike. The page lists 15 euros per day for rental (or 18 including insurance). The advantage is that you also do not need special equipment, as shoes, helmet and clothes.
Note: It is not complete clear to me from that webpage, whether or not you can rent the bike from this specific shop for only one day (see info & prices on the bottom of the page).
You can rent road bikes (like the ones they use in the Tour de France, the dutch word would be "wielrenfiets") for 40 euro a day, 75 euro a weekend and 112,50 euro a week on several locations in the netherlands, including most big cities at: road bike rental netherlands Or use this English language site.