53x12
- Thread starter yenrod
- Start date
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Will1985
Über Member
- Location
- South Norfolk
http://www.sheldonbrown.com/gears/ says that you'll be doing 50kmh at 90rpm and 55kmh at 100rpm.
I had this yesterday trying to spin round at 110rpm in 50x12 doing about 55kmh, so it sounds about right.
I had this yesterday trying to spin round at 110rpm in 50x12 doing about 55kmh, so it sounds about right.
Joe24
More serious cyclist than Bonj
- Location
- Nottingham
There wa a better link on Sheldons page, but all i could find was his one.
Put the stuff in and see.
Still cant find the link to the otherone i was thinking of.
Edit: Will beat me to it
Put the stuff in and see.
Still cant find the link to the otherone i was thinking of.
Edit: Will beat me to it
piedwagtail91
Guest
http://www.kreuzotter.de/english/ecadence.htm
i'd guess about 35mph for 100rpm roughly in line with sheldon
i'd guess about 35mph for 100rpm roughly in line with sheldon
Chris James
Über Member
- Location
- Huddersfield
My top gear is 52x12 which is pointlessly high in my opinion. For downhills above 35mph or so I go into an aero tuck anyway as I think I am faster as well as using no energy.
I can't imagine ever spinning out a 53/12. If we are saying 35mph for 100 rpm then that is pretty quick and most people would consider spinning out to be way above 100 rpm. So, I don't know 50mph before spinning out?
I can't imagine ever spinning out a 53/12. If we are saying 35mph for 100 rpm then that is pretty quick and most people would consider spinning out to be way above 100 rpm. So, I don't know 50mph before spinning out?
Chris James
Über Member
- Location
- Huddersfield
Mine's a triple
But I agree , which is why I suggested on the compact thread that a 50/39/30 triple makes more sense to me than a 52/42/30 albeit that there are lots of duplicated gears on triples so having gears that are 'too high' is less of a drama.
But I agree , which is why I suggested on the compact thread that a 50/39/30 triple makes more sense to me than a 52/42/30 albeit that there are lots of duplicated gears on triples so having gears that are 'too high' is less of a drama.
fossyant
Ride It Like You Stole It!
- Location
- South Manchester
I don't often get the need to spin a 53 x 13, as that's into tuck speeds at high revs.........certainly not in the UK and I am in the Peak's - far faster speeds are achieved by removing brain, depositing it in your rear pocket, and GOING FOR IT in a TUCK POSITION........ or brown pant's "ing" it !!
yenrod said:Anyone know the spin out speed of this gear combo...
The other day I was doing 30mph and it still 'hard' to pedal...
over 40mph. My 'terminal' velocity (on any hill i've tried so far anyway) is about 42mph and i find my top gear of 52x11 (which is higher than 53x12 btw) is about right for that.
My spinning out speed for my middle ring (42x11) is about 30mph.
hubgearfreak
Über Member
yenrod said:
i'd be interested to hear you theory to back up the first bit of this claim?
as for the second bit, how much quicker will a 50 toothed chainring wear out compared with a 52...that's right, a whopping 4%
hubgearfreak
Über Member
bonj said:
it'll depend upon the gradient of the slope of course. and wind speed and direction.. although wind speed and direction would be irrelevant after a certain, steepness of gradient
if you knew a chap knowledgeable in physics, he could probably work it out, or just trial and error.
as for your 42 being the max, is it through fear or just wind resistance? i once recorded 46.9mxs, and i'm sure that won't be the fastest