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Things that confuse you...

AmandaJR said:
My dogs adore cucumbers. They'll demolish a whole one in seconds. I decided to put some in my cheese sandwich and tasted the blighter for hours later. Told David to slap me if I EVER suggest eating cucumber again!
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I watched a funny clip on Facebook showing that lots of Cats are terrified of cucumbers.:eek::ROFLMAO:
 
srixon 1 said:
It is to do with gear ratios, and which gear is the driver and which is the driven. In simplistic terms, imagine the big gear has 100 teeth and the smaller gear has 25 teeth.
1) If the big gear is driving the smaller gear, then for every full revolution of the big gear the small gear will have for revolutions. A ratio of 4:1. On a bike you go faster but it is harder to pedal.
2) If the small gear was driving the big gear, it would take 4 revolutions of the small gear to make the big gear rotate once. A ratio of 1:4. On a bike you you go slow for what seems like a lot of effort.
Also, the derailers are spring loaded in one direction, from the large gears to the smaller gears. Ie "downhill" . You require force when you change "up" the rings as you are going against the spring tension.
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I have read that about ten times and it's like "eureka I've got it" and then read it again to memorise it and confuse myself afresh! I'm going to read another 10 times and see where I'm at. I think I'm struggling to conceive that one revolution of the front chainring can equal anything but one on the rear...and vice versa.
 
AmandaJR said:
I have read that about ten times and it's like "eureka I've got it" and then read it again to memorise it and confuse myself afresh! I'm going to read another 10 times and see where I'm at. I think I'm struggling to conceive that one revolution of the front chainring can equal anything but one on the rear...and vice versa.
Click to expand...

Try thinking of it this way; keeping the 100 tooth driving gear, you would need a 100 link length of chain to pass round it. The 25 tooth driven gear needs only a 25 link piece of chain to wrap round it. So when the 100 link chain moves once round the driving gear, it will go 4 times round the driven gear, thus turning the driven gear 4 times for every 1 turn of the driving gear. ;)

As regards the layout of the cogs, your lower gears need the big ring at the wheel (gear block) and the small ring at the pedals (chainset). The higher gears need the small ring at the block & the big ring at the chainset. By putting them on opposing sides of their respective blocks, it tends to keep the chain in the straightest possible line, thus increasing mechanical efficiency & reducing wear.

And if you want to work out how low or high your gears are, divide the teeth on the chainset by the teeth on the block and multiply by the diameter of the rear wheel in inches. On a bike with a 30-40-52 chainset and a 13-30 block, the highest gear would be 52/13 x 27 = 104 (hard work) and the lowest would be 30/30 x 27 = 27 (very easy). If you know all the intermediates you can work out what each gear actually is and how many overlap/duplicate.

Or you can just ride the bike. :)
 
AmandaJR said:
I have read that about ten times and it's like "eureka I've got it" and then read it again to memorise it and confuse myself afresh! I'm going to read another 10 times and see where I'm at. I think I'm struggling to conceive that one revolution of the front chainring can equal anything but one on the rear...and vice versa.
Click to expand...
Think of it like a clock .
One revolution of the big finger = only one hour of the little finger.
this is done through gears.
 
srixon 1 said:
Also, the derailers are spring loaded in one direction, from the large gears to the smaller gears. Ie "downhill" . You require force when you change "up" the rings as you are going against the spring tension.
Click to expand...
When I learned to properly index bike gears, that is when I learned that you can learn everything on YouTube. And later on I was annoyed that bar end shifters don’t index.
 
Why don't all car manufacturers design their boots big enough to take a full bag of golf clubs :confused:.
They must be losing out on a lot of sales for the sake of a couple of inches.:unsure:
 
Confused as to why all sorts of names get thrown into the hat as to who is the prems worst ref... When it really should be obvious to all, that week in week out, Mike Dean is the only genuine candidate for that 'accolade'...
 
Warm air rises.
So upstairs gets warmer the further into the day.
If warm air rises why doesn't it rise out of the windows and into the atmosphere..?
Why does it stay in the room and suffocate me..?
 
Imurg said:
Warm air rises.
So upstairs gets warmer the further into the day.
If warm air rises why doesn't it rise out of the windows and into the atmosphere..?
Why does it stay in the room and suffocate me..?
Click to expand...

Isn’t it due to the amazing insulation we have in our houses?
 
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