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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Quaife 5 speed gearbox
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<blockquote data-quote="Monkeypants" data-source="post: 144803" data-attributes="member: 2708"><p>Quaife Vincent ratios up until sometime in the early 2000s</p><p>1st 1:2.46</p><p>2nd 1:1.61</p><p>3rd 1:1.34</p><p>4th 1:1.075</p><p>5th 1:1</p><p></p><p>The 4th gear at just a 7% drop from top was likely racing inspired, as that was what Rod Quaife and John Surtees wanted the 5 speed for.</p><p>Eventually they changed that 4 th gear ratio to the current</p><p>1.134, which should be a bit more useful on a road bike.</p><p>Standard Rapide and late Shadow gears are</p><p>1st- 2.60</p><p>2nd- 1.61</p><p>3rd- 1.19</p><p>4th- 1</p><p></p><p>The 1.19 third in a standard Vincent is a really good road ratio for that engine in that it pulls hard from about 60 mph to over 100 mph.</p><p>The main reason for purchasing a Quaife has to be the shifting improvement. Also the cost might be lower than a standard gear cluster. The 5 speed Quaife was less expensive than a standard new 4 speed a few years back (10 already?) when gathering parts for the 1360 engine.</p><p></p><p>Glen</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 144803, member: 2708"] Quaife Vincent ratios up until sometime in the early 2000s 1st 1:2.46 2nd 1:1.61 3rd 1:1.34 4th 1:1.075 5th 1:1 The 4th gear at just a 7% drop from top was likely racing inspired, as that was what Rod Quaife and John Surtees wanted the 5 speed for. Eventually they changed that 4 th gear ratio to the current 1.134, which should be a bit more useful on a road bike. Standard Rapide and late Shadow gears are 1st- 2.60 2nd- 1.61 3rd- 1.19 4th- 1 The 1.19 third in a standard Vincent is a really good road ratio for that engine in that it pulls hard from about 60 mph to over 100 mph. The main reason for purchasing a Quaife has to be the shifting improvement. Also the cost might be lower than a standard gear cluster. The 5 speed Quaife was less expensive than a standard new 4 speed a few years back (10 already?) when gathering parts for the 1360 engine. Glen [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Quaife 5 speed gearbox
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