A road frame made from any material will not be designed with heavy load in mind. It will have tubes dimensioned to give the best possible ride for a rider in a certain weight range. Thats not to say it wont work, The extra weight is unklikely to push your total weight outside the design spec. But if you're looking to invest so much in this bike. You want the right tool for the job.
A touring/audax frame might well be built to the same stiffness/strength as a road frame. But the important difference will be that the geometry is more suited to loaded cycling. Seems mad to me to buy a flash Ti frame that handle poorly because it wasnt designed to be ridden back heavy.
A road frame made from any material will not be designed with heavy load in mind. It will have tubes dimensioned to give the best possible ride for a rider in a certain weight range. Thats not to say it wont work, The extra weight is unklikely to push your total weight outside the design spec. But if you're looking to invest so much in this bike. You want the right tool for the job.
A touring/audax frame might well be built to the same stiffness/strength as a road frame. But the important difference will be that the geometry is more suited to loaded cycling. Seems mad to me to buy a flash Ti frame that handle poorly because it wasnt designed to be ridden back heavy.
Look at something like this....
http://www.fatbirds.co.uk/5911/products/van-nicholas-yukon-road-audax-frame-with-free-fork-and-headset.aspx
http://www.spacycles.co.uk/products.php?plid=m1b0s21p2573&z=3096
http://www.fatbirds.co.uk/26117/products/lynskey-sportive-ultegra-titanium-audax-bike.aspx
http://www.burls.co.uk/audax.php