ADRENALINE-charged mountain bikers have been warned they are riding illegally around reservoirs in Bolton — and putting walkers at risk.

Countryside rangers working for United Utilities are having to stop cyclists and tell them they are breaking the law.

A spokesman for the water company said: “Riding your bike on footpaths is the same as riding on a pavement in a built-up area — it is technically illegal — the rules are there to protect walkers.”

The problem came to light after cyclists riding around Entwistle Reservoir were warned by a ranger.

United Utilities said some cyclists know they are breaking the law but continue to ride — sometimes at breakneck speeds — on the footpaths around some of Bolton’s most popular beauty spots.

The spokesman said: “We tend to find those who break the rules may do so in all innocence, and that’s fine — a timely reminder is the best response. We do, however, also get problems with mountain bikers who are well aware which routes are footpaths and which are bridleways, but they actively seek out the steepest, most adrenaline-charged routes — regardless of other users on foot. This is the biggest problem our countryside rangers face.”

The company advises cyclists to check maps on the internet before setting off.

But United Utilities defended the lack of signs advising cyclists, because they would be an eyesore.

The spokesman said: “There are plenty of bridleways around local reservoirs, which means you can still have a great day out on your bike, without impairing the enjoyment of walkers.

“Not all bridleways and footpaths are marked by signs because no one wants to see a forest of signs in a beautiful area of countryside, so there is an onus on the individual to take some responsibility.

“We certainly don’t want to be killjoys — we want everyone to enjoy our reservoirs this summer, whether you are on two wheels or on foot.

“Please act responsibly, and if possible, check your route before setting out.”