"We do typically see an increase, so riders need to be aware.
"Keep your property locked and secure, it is no protection to just have it unlocked and up on a car rack."
He advised not leaving the bike unattended or without supervision.
"The public can help."
He said often with these higher end mountain bikes it was apparent when they didn't belong to their owner.
"If people don't perhaps fit the high end mountain bike, call the police."
During last year's event the community helped with the safe return of several bikes back to their owners by calling in suspicious behaviour.
Crankworx business development manager Tak Mutu said it was always a "bummer" when people thought they had the right to take others belongings.
"It's not just bikes, it's watching your other gear as well.
"There is designated bike parking at Crankworx, where people can lock up their bikes and there is a security guide near by."
Mutu said it all came down to common sense.
"It's opportunist bike thefts, not organised crime.
"It doesn't matter where you go in the world, there are rats*** people.
"So I don't think it reflects too much on us as a town, but of course we do all take it personally."
If you notice suspicious behaviour information can be given to Rotorua police on (07) 348 0099 or the anonymous Crimestoppers line on (0800 555 111).
