But that is just cadence and not speed monitor, so wouldn't be any good for turbo trainer / rollers.
Eh? It works fine on a stationary trainer.
If you want speed... that would be where the speed sensor I mention comes in handy!
yeah thats the garmin speed/cadence sensor at £60
http://www.amazon.co.uk/gp/product/B00JM6DKUA/ref=s9_simh_gw_p23_d0_i2?pf_rd_m=A3P5ROKL5A1OLE&pf_rd_s=center-2&pf_rd_r=0CVBSJSM5X1F38JQNQ16&pf_rd_t=101&pf_rd_p=455344027&pf_rd_i=468294
cheers for the suggestion freezing77, sadly not very good reviews by the sounds.
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But that is just cadence and not speed monitor, so wouldn't be any good for turbo trainer / rollers.