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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Tyres
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<blockquote data-quote="Hugo Myatt" data-source="post: 83542" data-attributes="member: 99"><p>19" front and 19" rear on WM2 rims was the spec supplied to the Argentinian market. I have this on one of my Comets - 3.25S x 19 Speedmaster AM6 on the front, 3.50S x 19 Safety Mileage AM7 on the rear. The handling is satisfactory, at least to me, and until the rear SM wears square that is, but I'm with Albervin here. 28 psi on the front is the max or it begins to feel like a road drill. 3o/32 psi on the rear keeps a more rounded profile on the SM.</p><p></p><p>My other Comet has standard 20"WM1 front and 19" WM2 rear fitted with 3.00S20 Speedmaster front and 100/90V - 19 Roadrider at the rear. This seems even more secure on the bends but I'm hardly an 'earholer'. The only problem with 20" fronts is the difficulty of getting tubes. The ones I purchased from the spares company have two sizes marked on the tube - 20x300 and 21 x300! They also do not hold their pressure for very long and need to be checked before every ride.</p><p></p><p>Incidentally why are tubes now supplied with two nuts on the valve stem and where does the second nut go?</p></blockquote><p></p>
[QUOTE="Hugo Myatt, post: 83542, member: 99"] 19" front and 19" rear on WM2 rims was the spec supplied to the Argentinian market. I have this on one of my Comets - 3.25S x 19 Speedmaster AM6 on the front, 3.50S x 19 Safety Mileage AM7 on the rear. The handling is satisfactory, at least to me, and until the rear SM wears square that is, but I'm with Albervin here. 28 psi on the front is the max or it begins to feel like a road drill. 3o/32 psi on the rear keeps a more rounded profile on the SM. My other Comet has standard 20"WM1 front and 19" WM2 rear fitted with 3.00S20 Speedmaster front and 100/90V - 19 Roadrider at the rear. This seems even more secure on the bends but I'm hardly an 'earholer'. The only problem with 20" fronts is the difficulty of getting tubes. The ones I purchased from the spares company have two sizes marked on the tube - 20x300 and 21 x300! They also do not hold their pressure for very long and need to be checked before every ride. Incidentally why are tubes now supplied with two nuts on the valve stem and where does the second nut go? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Tyres
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