During our eventful trip to Grizedale yesterday, I was chatting to the mechanic at the bike shop at the visitor’s centre as he bled the rear brake of my wife’s Giant NRS. He noticed the Burley towing bracket and warned me about the risks of towing with a full suspension bike. He mentioned that is increases the risk of pivot problems and puts lateral forces on the shock which can lead to failure.
As he maintains a fleet of hire bikes including multiple pivot full suspension bikes, and provide Burley trailers- I’m guessing he’s got first hand experience and is giving sound advice.
I’m not too worried about my wife’s bike. It very rarely tows. If it does, it tends to be on smooth forestry road downhills (like at Grizedale, when I do a cheeky section of the NFT then meet back up.) With my armchair engineer hat on, I was wondering which would put more strain on a full suspension bike; heavy off road use or towing. I’d have thought towing puts more of a contant pressure on pivots, where as heavy landings are ‘spikes’ of high load. I’m guessing that bushes and bearings can be loaded in tension or compression (as tension on one side is the same as pressure from the other) and from any direction. I’d have also thought that unless you develop play in the pivots, the linkages themselves prevent any lateral forces on the shock.
I’d be interested he hear other’s opinions or experiences.
(By the way, hats off to the mechanic (sorry, didn’t catch his name) for finding the time on a busy bank holiday weekent to do some emergency work on Mrs M’s bike to salvage our day!)