Living Car Free - bicycle designs -- cargo attachment.

Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.




godspiral
06-07-06, 09:58 AM
I thought of some pretty easy modifications to bicycles that would make them better at carrying things. What I'd specifically/ultimately like to carry is a small golf club bag, but the modifications would be useful for a wide variety of apps.

Starting with a "women's" MTB frame with sloping top tube....

welding or clamping on an infant's handlebars to the top tube about 1 foot from stem will provide extra hooks to hang grocery bags, and provide the basic wide support for carrying long items along the top tube. May as well fasten 2 sets close to the front.

A useful custom made part could provide the above, but also provide an extendible bar that angles up from the top tube, and can be extended over handle bars. The part would fasten/clamp in 2 or 3 spots along the top tube. The main advantage of the protrusion is that it would support a small load without impacting handlebar turning at all. It needs to be extendible, not only to accomodate a range of items, but also to be able to use handlebars for support with some items.

Fastening something on the seattube that can ideally slide up and down would be useful to clamp down on what you are carrying, but more importantly provide the top anchor for a strap (like the ones found at the bottom of on golf pull carts).

wide pedals would be a useful option.

The above setup would also be good for touring, allowing fairly big dufflebags to be carried along the top without interfering with knees or handlebars.

Another feature the top tube mount could provide is an alternate pair of high handlebars that can both be used by beginers/cruisers on a slow commute, and as elbow rests for aerodynamic positions for advanced cyclists getting to a destination more quickly. The linking between the 2 handlebars for cruising could be with just bungie cords.

Has this been done before? -- too much variation between top tube designs for an aftermarket attachment?

I found a great department store women's frame MTB bike this year for $90. Sturdy, heavy, with big tires. Would seem useful to have a short run cargo/all-purpose bike for what is basically the cost of a trailer.


MichaelW
06-08-06, 10:23 AM
Steel touring bikes have been made with a wide variety of braze-on fitttings. Braze-on is generally better than a clamp, the fitting is more secure, smaller and lighter.
Anything across the top tube will interfere with your legs during a dismount. I carry large planks and poles simply by lashing them along the top tube and rack, sticking out about 1m to the front of the bike.
There are already plenty of good ways of carrying grocery bags including F and R panniers, F baskets, rack-top baskets. Wicker is an excellent material for bike baskets.
Useful loadcarrying systems might be:
Rear luggage racks with extendable top plates or extra wide clip on plates.
A head tube bracket to hold long items away from brake cables. Brompton bikes come with a lug on the HT to bolt on various luggage systems.