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Not just feel. The lower kinetic energy means that riding on the turbo is not the same as riding on the road (durrrh). There are different muscle recruitment involved, as you have to push through the deadspots. One of the reasons claimed that power on the turbo is often (considerably) lower than the power you can put out on the road for the same percieved effort.
The lower KE is more akin to the pedaling technique required when riding through mud or uphill.
Adding weight to the wheel increase the amount of kinetic energy in the system (flywheel effect). Run down times on the turbo are very short - for example perhaps 10-20s from 20mph. On the (flat) road the run down time would be much longer.
There is a massive thread on the TT forum about it if you need to get to sleep...
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danb
@hippy
What's the deal with adding weights? Just to get better road feel or something?
If you notice the difference over the taste of blood and imminent death you're not turbo training properly. ;)