Thorn-resistant tubes. And a big belly.

PowerCranks, although that only works for a few weeks. :-)

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Frank,
An original Ironman and the Inventor of PowerCranks

you could put some bags of concrete in one of those tow behind kids trailers.

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This is your life, and it's ending one minute at a time. - Fight Club
Industry Brat.

Don't forget the reflectors and if you can find one, one of those lights with a generator that runs off the wheel friction.

Should add: purpose is to get a better/longer workout on a flat commute on multi-use paths that limit bike speed, so its hard to get continuous time at threshold. Slowing down the bike, through increased aerodynamic drag/friction etc. means getting more training for the same miles.

This isn't my racing tri-bike, so about any modifcation that is safe is okay.

Anyone else faced with these same issues (bike path, speed limits due to bad roads, etc.)?

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some days you're the windshield some days the bug

Some sort of Camelback-ish beer delivery system?

LOL

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some days you're the windshield some days the bug

Zero to PUPM in 3 posts! That's got to be a record!

good idea! but the trails are kind of rough and narrow in spots, so the trailer might bounce all over the place or take out a sign or two...

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some days you're the windshield some days the bug

This would be a great add to the slow-bike project; do you know if they still make these?

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some days you're the windshield some days the bug

Just stay in your 39/27. That will slow you down and give you a good workout.

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Frank,
An original Ironman and the Inventor of PowerCranks

Take some pieces of plastic (say, from a milk jug or a bleach bottle) and tape them to the spokes making them into a big fan (alternate direction so you don't end up with a lot of side force).

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Some are born to move the world to live their fantasies...

https://triomultisport.com/
http://www.mjolnircycles.com/

Slime
lower pressure
Knobby tires
Bigger gear
Front basket
Paniers
Jacket 1/2 zipped
Generator lighting system
Cards in the spokes

I often thought about designing a friction hub system which allows the rider to dial in the amount of resistance. IMO, it would be a pretty cool training tool...

Thats true, but I want to try to get threshold work at optimal cadence/high resistance, not fast spinning at low resistance.

Thought about going your big gear route - 53/12 fixed, or something like that, but have seen some good reasoning behind NOT doing slow cadence/big gear and high cadence/big gear would be way too faast for my route.

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some days you're the windshield some days the bug

You could ride with me, or.... maybe switch to a TitanFlex

Awesome suggestion - would have double benefit of creating big belly that was suggested earlier - but I can't do threshold work on carbonated drinks, too much gas.

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some days you're the windshield some days the bug

The problem with the big gear approach is it will be hard to keep the speed down. If you can increase the "rolling resistance" of your bike enough you will find the "small gears" plenty hard at bike path speeds.

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Frank,
An original Ironman and the Inventor of PowerCranks

The trailer wouldn't bounce as much if it had a keg in it!

They have several listed at e-bay: http://cgi.ebay.com/...QQrdZ1QQcmdZViewItem

It doesn't say if it works but some look new.

Running parachute.

Edit: I imagine it's fun and entirely safe.

Attach your trainer inverted to your rear wheel with max tension.
watched an athlete do hills that way

OMG.

Can see how this might be possible but .... kids need me alive another few years to pay for college

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some days you're the windshield some days the bug

Hokey Spokes.

How about "flat beer"? You could dig up the old "How do you make flat coke" thread and see if the same principles apply to beer. ;-)