Tests on a conventional mountain bike found a stopping distance of around three metres but Alliston's model was four times longer, at some 12 metres, the court heard.
Cross-examining, Mark Wyeth QC asked Mr Small if there could be a margin of error in his calculations of the average speed Alliston was going before he saw Mrs Briggs.
The expert replied that any difference would only have been a "fraction of a mile per hour".
Some more copy on stopping distances:
Tests on a conventional mountain bike found a stopping distance of around three metres but Alliston's model was four times longer, at some 12 metres, the court heard.
Cross-examining, Mark Wyeth QC asked Mr Small if there could be a margin of error in his calculations of the average speed Alliston was going before he saw Mrs Briggs.
The expert replied that any difference would only have been a "fraction of a mile per hour".