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PostPosted: Mon Jul 01, 2013 6:52 pm 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
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Location: 54 Festive Road Winchcombe GLOUCS Yarp...
This is not strictly and MTB or Road question but applies to both.

I have two interchangeable front cranks one 49T and one 48T given that the bike is a 5 speed 12-28 does the one less tooth make that much difference across the range or just on the climb or not? Anyway have fitted the 48.

can someone enlighten me?

Sticking this in the MTB section as well to see who is the most helpful and or articulate. :mrgreen:


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PostPosted: Mon Jul 01, 2013 6:56 pm 
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Joined: Mon Feb 01, 2010 8:57 pm
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Smaller chainring will give you a slightly lower gear range i.e. it would make a small difference to your speed pedalling flat-out, but make climbing a touch easier.


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PostPosted: Mon Jul 01, 2013 7:02 pm 
Gold Trader / PoTM Winner / RB Rider
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Location: 54 Festive Road Winchcombe GLOUCS Yarp...
Thanks. I get that but would just the one tooth make it worth buying/supplying/changing rings?

Does an extra tooth ave more effect front or rear or the same?


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PostPosted: Mon Jul 01, 2013 7:05 pm 
retrobike rider
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There's a simple gear calculator at http://sheldonbrown.com/gears/, why not put in your data and give us the result?


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PostPosted: Mon Jul 01, 2013 7:13 pm 
Gold Trader / PoTM Winner / RB Rider
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Location: 54 Festive Road Winchcombe GLOUCS Yarp...
Simple? :lol:


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PostPosted: Mon Jul 01, 2013 7:37 pm 
rBoTM Winner
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Location: Mansfield Woodhouse, Nott's.
Easy answer that is, quite easy!


Image

Image




:facepalm:


Last edited by Ian Raleigh on Mon Jul 01, 2013 8:23 pm, edited 1 time in total.

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PostPosted: Mon Jul 01, 2013 7:54 pm 
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Joined: Tue Oct 16, 2012 4:16 pm
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Location: NOTTINGHAM
Tremendous that Ian - made me laugh that one.

On a geared bike I can't believe it makes huge differences, but if we're talking single speed it's a whole different story. Just changed my rear sprocket which now gives me 91 gear inches from 85 on the old sprocket - possibly a tooth too far as getting it turned over isn't too good on the knees - that's by reducing one tooth and it's hugely noticeable.

As stated you may lose a fraction of speed in top gear, hills will be marginally easier.


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PostPosted: Mon Jul 01, 2013 8:03 pm 
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Location: It's not easy being a dolphin.
It will make the difference between the Olympic podium or simply being relegated to tootling around Norfolk with a Carradice saddle bag. Choose wisely!


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PostPosted: Mon Jul 01, 2013 8:04 pm 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
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Joined: Tue Feb 26, 2013 6:26 pm
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Location: 54 Festive Road Winchcombe GLOUCS Yarp...
Nice. Wish I lived in Norfolk. A little hilly round here. Will have to choose routes carefully.


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PostPosted: Mon Jul 01, 2013 8:17 pm 
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Joined: Mon Feb 11, 2008 9:42 am
Posts: 2370
Www.gear-calculator.com

Think that's the one, uses Flash so I can't check on my tablet!
That's a nice graphical interface/calculator


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