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Tai Woffinden Crash in Krosno


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18 minutes ago, gjcone44 said:

even google knows speedway bikes dont get drive of concrete, i suggest you all read my statement again, apologies' not accepted,  there is some rubbishe spoken on here. 

older generation will remember concrete start line soon got banned

blue groove where do they come from?

so you have been in speedway for so long and never heard a saying track was that slick its like riding on concrete.

It's not really important is it, this thread is about Tai.

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23 minutes ago, gjcone44 said:

even google knows speedway bikes dont get drive of concrete, i suggest you all read my statement again, apologies' not accepted,  there is some rubbishe spoken on here. 

older generation will remember concrete start line soon got banned

blue groove where do they come from?

so you have been in speedway for so long and never heard a saying track was that slick its like riding on concrete.

There is a big posting about onetime concrete starting grids, a posting by Gresham on the 15th May, 2016. Speedway tracks, apparently, used to have concrete starting grds, but were banned. 2 schools of thought were discussed as the reason. 1. due to a lip being created and the concrete grid could act as a take off ramp. 2. due to the change in surface grip, making things dangerous. Flipping at the start was also suggested. 

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1 hour ago, Ray Stadia said:

There is a big posting about onetime concrete starting grids, a posting by Gresham on the 15th May, 2016. Speedway tracks, apparently, used to have concrete starting grds, but were banned. 2 schools of thought were discussed as the reason. 1. due to a lip being created and the concrete grid could act as a take off ramp. 2. due to the change in surface grip, making things dangerous. Flipping at the start was also suggested. 

You're spot on.

In the early days of cinder tracks it was hard to produce a good starting area, as the back wheel spinning dug big ruts, worse than the ruts dug in modern shale tracks.   Also electric cables to operate the starting gate etc often ran under the track and needed protection.  In those glorious days before Health & Safety, the easiest solution was to concrete over the starts.

Again, as you say, this was dangerous due to a lip being created which would act as a take-off ramp, and dangers due to the increasing grip on change of surface.   (As previously discussed with riders hitting a concrete kerb and taking off - the coefficient of friction between a rubber tyre and concrete is much higher than that between rubber and shale).  Also, as anyone who has looped a bike will attest, landing on a shale track hurts a lot, but landing on concrete hurts a hell of a lot more.

As track preparation techniques improved, with better quality shale surfaces replacing cinders, concrete starting grids were banned.

 

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11 hours ago, RoundTheBoards said:

... the easiest solution was to concrete over the starts.

Again, as you say, this was dangerous due to a lip being created which would act as a take-off ramp, and dangers due to the increasing grip on change of surface.   (As previously discussed with riders hitting a concrete kerb and taking off - the coefficient of friction between a rubber tyre and concrete is much higher than that between rubber and shale).  Also, as anyone who has looped a bike will attest, landing on a shale track hurts a lot, but landing on concrete hurts a hell of a lot more.

As track preparation techniques improved, with better quality shale surfaces replacing cinders, concrete starting grids were banned.

 

Although an intact one survives at California Country Park.

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