Johan Bornman Posted February 23, 2009 Share I like the comments about riding into the wall, shooting out the garage into the traffic etc.However, coming off a roller produces almost no forward motion since the inertia in a spinning bike is very small - only the revolving inertia of the two lightweight wheels. If you come off the roller at high speed you'll barely shoot forward a meter (I haven't done this, just guessing how much energy the wheels will have) before falling over.I've seen lots of comments in the past where people claimed to have gone through a TV set or into the audience at shows. Not possible. But it is a humourous thought.You'll also notice that you can accellerate very quickly on rollers. This is because you only have to accellerate the wheels, rollers and drive rubber. On the road you have your and the bike's entire weight to accellerate. Link to comment Share on other sites More sharing options...
SwissVan Posted February 23, 2009 Share Where? On the floor or in your undies? Depends on when last you...., definetly on the carpet. Rollers with restaince if you can get them would be great. Saris (powertap people) also market one http://www.saris.com/images/PRODUCT/large/335.jpg Link to comment Share on other sites More sharing options...
TiBones Posted February 23, 2009 Share do a youtube search for roller trainers. You will laugh at the funny ones and cry when you see how good some of those guys are. its not so easy but from what I've heard, well worth the effort Link to comment Share on other sites More sharing options...
MCDreyer Posted February 23, 2009 Share Maybe I can try it out at one of the cycle shops... Not sure if they'll let me. If I can ride on the roller at a heart rate of between 55% and 65% it would be more than enough. Link to comment Share on other sites More sharing options...
Johan Bornman Posted February 23, 2009 Share Don't use it in a garage with the door closed when you first try ...... Experience talking? yip ...... off the roller into the garage door at speed' date=' bump the shelves with the tins on, can on back of head yoh [/quote'] Ben, this is funny. How far from the door were you and how big was the impact. Was this a MTB with heavy wheels or a road bike? I can vouch for Swissvan's skidmarks - that I've seen, but wheels readily cause skidmarks. Their propensity to do so is directly proportional to the cost of the floor and the owner's attitude. Link to comment Share on other sites More sharing options...
NotSoBigBen Posted February 23, 2009 Share I like the comments about riding into the wall' date=' shooting out the garage into the traffic etc.However, coming off a roller produces almost no forward motion since the inertia in a spinning bike is very small - only the revolving inertia of the two lightweight wheels. If you come off the roller at high speed you'll barely shoot forward a meter (I haven't done this, just guessing how much energy the wheels will have) before falling over.I've seen lots of comments in the past where people claimed to have gone through a TV set or into the audience at shows. Not possible. But it is a humourous thought.You'll also notice that you can accellerate very quickly on rollers. This is because you only have to accellerate the wheels, rollers and drive rubber. On the road you have your and the bike's entire weight to accellerate. [/quote'] I was only 2 meters from the door ..... Link to comment Share on other sites More sharing options...
Willehond Posted February 23, 2009 Share Don't use it in a garage with the door closed when you first try ...... Experience talking? yip ...... off the roller into the garage door at speed' date=' bump the shelves with the tins on, can on back of head yoh [/quote'] Ben, this is funny. How far from the door were you and how big was the impact. Was this a MTB with heavy wheels or a road bike? I can vouch for Swissvan's skidmarks - that I've seen, but wheels readily cause skidmarks. Their propensity to do so is directly proportional to the cost of the floor and the owner's attitude. Who said his wheels caused the skidmarks??? Link to comment Share on other sites More sharing options...
NotSoBigBen Posted February 23, 2009 Share The impact against the door was minimal but the sideways fall (couldn't get out the pedals quick enough) was significantly more and dislodged some cans from the shelves one of which made contact with the back of the pip! Link to comment Share on other sites More sharing options...
The_Break Posted February 23, 2009 Share It also depends who built the wheels. If Bornman did then you gonna go through the garage door. Link to comment Share on other sites More sharing options...
SwissVan Posted February 23, 2009 Share I like the comments about riding into the wall' date=' shooting out the garage into the traffic etc.However, coming off a roller produces almost no forward motion since the inertia in a spinning bike is very small - only the revolving inertia of the two lightweight wheels. If you come off the roller at high speed you'll barely shoot forward a meter (I haven't done this, just guessing how much energy the wheels will have) before falling over.I've seen lots of comments in the past where people claimed to have gone through a TV set or into the audience at shows. Not possible. But it is a humourous thought.You'll also notice that you can accellerate very quickly on rollers. This is because you only have to accellerate the wheels, rollers and drive rubber. On the road you have your and the bike's entire weight to accellerate. [/quote'] True IMO the biggest danger are the cleats on your shoes... rollers raise you a few inches higher off the ground than normal, if you manage to ride off and put your foot down to catch yourself what usually happens is that your cleat slides out sideways and only stops when you reach the "full split" position. This is particularly easy on those shiny concrete garage floors or tiled interior floors. A non slip carpet strategically placed on the side is a recommendation. <?: prefix = o ns = "urn:schemas-microsoft-com:office:office" /> Link to comment Share on other sites More sharing options...
jmaccelari Posted February 23, 2009 Share ...However' date=' coming off a roller produces almost no forward motion since the inertia in a spinning bike is very small - only the revolving inertia of the two lightweight wheels. If you come off the roller at high speed you'll barely shoot forward a meter (I haven't done this, just guessing how much energy the wheels will have) before falling over.... [/quote']I'd agree with this. Every time I've come off I've bliksemed over sidewaysand certainly never shot forwards through the glass patio doors intothe pool... I have learnt not to cycle on the carpet, though... Link to comment Share on other sites More sharing options...
droo Posted February 23, 2009 Share Don't use it in a garage with the door closed when you first try ...... Experience talking? ? yip ...... off the roller into the garage door at speed' date=' bump the shelves with the tins on, can on back of head yoh [/quote'] ? Ben, this is funny. How far from the door were you and how big was the impact. Was this a MTB with heavy wheels or a road bike? ? I can vouch for Swissvan's skidmarks - that I've seen, but wheels readily cause skidmarks. Their propensity to do so is directly proportional to the cost of the floor and the owner's attitude. ? Yup, bought that T-shirt myself (minus the paint can, I was following my own advice and practicing on the lawn outside.) Johan, it is possible, and you're right, you don't go far. But far enough for skidmarks, and a few choice words. But I do have fairly heavy wheels. All my upgrade money goes into my MTB Link to comment Share on other sites More sharing options...
Johan Bornman Posted February 23, 2009 Share I was only 2 meters from the door ..... No helmet, no ride. Link to comment Share on other sites More sharing options...
L'Bie Posted February 23, 2009 Share I like the comments about riding into the wall' date=' shooting out the garage into the traffic etc.However, coming off a roller produces almost no forward motion since the inertia in a spinning bike is very small - only the revolving inertia of the two lightweight wheels. If you come off the roller at high speed you'll barely shoot forward a meter (I haven't done this, just guessing how much energy the wheels will have) before falling over.I've seen lots of comments in the past where people claimed to have gone through a TV set or into the audience at shows. Not possible. But it is a humourous thought.You'll also notice that you can accellerate very quickly on rollers. This is because you only have to accellerate the wheels, rollers and drive rubber. On the road you have your and the bike's entire weight to accellerate. [/quote']All entirely true. I almost thought I wasn't going fast enough, but JB has got the sience bit right. it didn't happen to me and I am prepared to scoff at those warnings about the telly etc. When the wheels go off the rollers the bike and wheels stop pretty quickly.BTW, why train in front of the telly? Is it because you fear missing "7de Laan"? Link to comment Share on other sites More sharing options...
Johan Bornman Posted February 23, 2009 Share Johan' date=' it is possible, and you're right, you don't go far. But far enough for skidmarks, and a few choice words. But I do have fairly heavy wheels. All my upgrade money goes into my MTB [/quote'] The skidmarks just show you how high your body's inertia is. The tyre will rather skid than accellerate. In fact, I can create skidmarks on my workbench by spinning a tyre and dropping it. Just its own inertia is too much for the sudden accelleration. That's why my eyes always roll involuntary (I close them not to offend) when someone tells me they can feel they're accellerating quicker now that they've invested in aluminium nipples or such. Now....who turned this funny thread into a science class? Link to comment Share on other sites More sharing options...
jmaccelari Posted February 23, 2009 Share That's why my eyes always roll involuntary (I close them not to offend) when someone tells me they can feel they're accellerating quicker now that they've invested in aluminium nipples or such. Aluminium nipples? Sounds painful... Link to comment Share on other sites More sharing options...
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