scousemouse
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« on: January 06, 2009, 10:53:07 AM » |
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alrite lads im trying to work out my tyre size and speed at revs etc etc but i cant find any info on it ? the bike is a cx500 ive got 2 axles but need to know which is the best to use 1 - is a reliant b/axle 2.78/1 2 - is 3.545/1 my tyres are 27""   any advise please ?? |
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Simple Simon
Hero Member
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Posts: 707
Champion Air Rider
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« Reply #1 on: January 06, 2009, 12:01:57 PM » |
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I will do it! I will do it! I will do it! I will do it! ........
well in a minute.. or... tomorrow..... OK maybe next week!
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scousemouse
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« Reply #2 on: January 06, 2009, 01:24:39 PM » |
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yes show one off them but says 102-147mph witha 3.55 ratio 118-170mph ?? with a 3.08 ratio !!  with a 2.7 ratio ? them speeds cat be right ? on a cx500 ??
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tony b
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« Reply #3 on: January 06, 2009, 04:56:50 PM » |
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if it is rite im gettin meself a cx 500.
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it wasnt me ,you cant prove it;
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morrag
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Posts: 2875
Carpe diem!
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« Reply #4 on: January 06, 2009, 08:47:16 PM » |
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Your calculations are obviously amiss! I run a Honda GL 500 trike, the motor being effectively the same as a CX500. The GL rear wheel size is orig ionally 16", whereas the CX is 18", however the effective final overall ratio is 3.09:1. I'm using the more or less 'cooking' Reliant axle, albeit narrowed by 6", and that's a 3.23:1, which, whatever you may hear to the contrary, most are.The o/a diam. of the bikes 16" rear wheel inc. a 120/90x16 tyre, is approx.24", the Ford 13" rear wheels I use, with 175/70 tyres, gives an o/a diam of 23", so a rolling radius diff. of only 1/2", bugger all in the greater scheme of things!If you can go up to 14", or even 15" rears,with a similar aspect ratio tyre, so much the better, as whilst mine pulls like a train in all gears, to a max of around 75mph, it could handle a "couple of teeth", if you know what I mean, on the rear wheels, no bother. So there you go, I built mine to that spec. and I'm pleased with the outcome, so why reinvent the 'wheel'!, eh, hope this is of some assistance, Morrag
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Beware the Ides of March, But!
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scousemouse
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« Reply #5 on: January 06, 2009, 09:08:54 PM » |
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ive already got my wheels and tyres 265.50r16 27"" see what it goes like ?? i was using the ratio link as above to the speeds i quote ? i would be happy with 75mph  |
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morrag
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Posts: 2875
Carpe diem!
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« Reply #6 on: January 06, 2009, 09:13:23 PM » |
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Well there you go, problem solved, stick with the 16" and you should see 80'sh,( with a following wind!), seriously, it will give you a much more "usable", 2nd&3rd gear, cheers, Morrag
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Beware the Ides of March, But!
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scousemouse
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« Reply #7 on: January 06, 2009, 09:25:30 PM » |
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hey morrag hope mine look as good as that  |
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tazet
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« Reply #8 on: January 06, 2009, 09:36:52 PM » |
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So when we getting the write-up on your trike then Morrag Pretty please |
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morrag
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Carpe diem!
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« Reply #9 on: January 07, 2009, 12:37:44 AM » |
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Yeah Taz, I really intend getting to that honest, and my latest effort,......soon....Morrag
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Beware the Ides of March, But!
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tbone
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« Reply #10 on: January 08, 2009, 07:22:31 AM » |
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Use that link as a guide only! It`s obvious that it is intended for cars using car engines.
With a RWD car if it's got a top gear ratio of 1:1, then if the crank is turning at 10,000 RPM, then the driveshaft is turning at 10,000rpm.
With the vast majority of bike engines, there's a primary reduction between the crank and the clutch.
So when the engines turning 10,000 rpm given that you have the same 1:1 ratio for top gear (unlikely) the drive shaft is probably turning in the region of 3,000-5,000 rpm.
You need to know the ratio of the original bevel box and the height of the original rear wheel. Usually it won't work out neat because if the manufacturer wants a final ratio of 3:1 and the crownwheel has 30 teeth they won't use 10 teeth on the pinion, but 9 or 11 instead, that way the same two teeth only mesh every 30 revolutions and any wear is evened out.
Anyway, divide the wheel height by the original ratio, then multiply this number by your new ratio, this will then give you the wheel size needed to maintain (as near as dam it) original gearing.
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NO I WON`T. aye ok then, i will
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morrag
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Posts: 2875
Carpe diem!
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« Reply #11 on: January 08, 2009, 08:39:01 PM » |
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Tbone, you are of course, absolutely correct with that last piece of advice, I only threw in my own experience with a similar set up of motor and final drive, for practical comparison, and in the hope it might go someway to reassuring Scouse with regard to using the kit he has got, cheers for now both, Morrag
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Beware the Ides of March, But!
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scousemouse
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« Reply #12 on: January 08, 2009, 08:53:17 PM » |
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yep thanks for the advise built going well ?? ish making the rear swing arm today gunna finish it tomorrow and add pics im still looking for a halfshaft and hub ?? im also shortening the halfshaft ive got tomorrow (will add pics)
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tbone
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« Reply #13 on: January 08, 2009, 09:01:54 PM » |
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All the theory in the world aint worth bugger (can i say that?) all if it doesn`t work in practice, You cant get better advice than the advice of one who has been there and done it  |
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NO I WON`T. aye ok then, i will
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