mpr84 Posted October 7, 2017 Report Share Posted October 7, 2017 Hi just seeing if anybody can tell me what the tyre and sprocket sizes should be on a Ossa 250 Verde 1979 please. Also am I rite in thinking that the chain tensioner bolts onto the chain guard. Thanks, Martin Quote Link to comment Share on other sites More sharing options...
woody Posted October 7, 2017 Report Share Posted October 7, 2017 Rear 42 teeth, front 11 teeth. Tyres are normal trials tyres, 4.00 x18" rear, 2.75 x 21" front Chain tensioner is fixed to the brake pedal pivot spindle, not fixed to the swingarm / chain guard. If yours does someone has modified it This is what the tensioner should look like http://www.ebay.co.uk/itm/OSSA-MICK-ANDREWS-CHAIN-TENSIONER-OSSA-MAR-OSSA-EXPLORER-NEW-CHAIN-TENSIONER-/381111480886?hash=item58bc03b236:g:IoMAAOSwyZ5UqCc8 Quote Link to comment Share on other sites More sharing options...
mpr84 Posted October 8, 2017 Author Report Share Posted October 8, 2017 Cheers for that I will get some ordered this week. Had a look at the tensioner and mine looks like it is a fixed one its just worn out a bit, it dose have little thin tube sticking out from the swinging arm that I'm not sure what its for. The little tube is properly welded into the frame and has a little hole drilled straight through. Thanks, Martin Quote Link to comment Share on other sites More sharing options...
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