- The road TF38 between Boca del Tauce and Chio is generally in a pretty shitty condition. Why? It has several large potholes, especially closer to Boca del Tauce. Yes it is possible
to do on a road bike (better with 25c tyres I'd imagine), but the road is badly in need of resurfacing. The main problem is that the asphalt/bitumen matrix has worn away, exposing the relatively coarse aggregate, so it just isn't smooth anymore. I'm sure they'll eventually resurface it. In it's current state, you probably won't enjoy riding it on a road bike. On a MTB this is not a problem. But please don't misunderand me: it's one of the least travelled routes to get to Mt Teide.
- The road TF51 between Vilaflor & La Escalona. While there's nothing wrong with the actual surface, for some reason, it's lumpier than hastily-made custard. So more than 20km/hr feels very bumpy. Again, mountainbikes with slicks won't have any trouble coping with this road.
- If you're planning on cycling along the coast between Costa Adeje and Los Gigantes, know that road TF47 now experiences a pretty constant stream of traffic. There is also no shoulder. For this reason, if you're travelling between Las Americas/Los Chrisitanos and the west of Tenerife, going via TF82 to Guía de Isora is a much better route for cycling than TF47.
- The short road TF24 between La Esperanza and La Laguna is narrow, with high speed traffic. As far as I remember there is no shoulder, and cars shoot past like missiles along this stretch.
- Riding on the three Tenerife freeways TF1, TF2 and TF5 is prohibited by spanish traffic law.
- If you know of any other poor-quality roads not suitable for road bikes, please e-mail me, and I'll add them here when I can.