i have one 5300 30c about 6 months old used every weekend but still fine £45 same as this one
http://www.racing-cars.com/pp/Manufa.../SLR5303H.html
and a 5300 40c same as this one
http://www.racing-cars.com/pp/Manufa.../SLR5545H.html
£55 4 months old used weekly both are fine