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Noticeable difference on steep hill 20.3 vs 25.3 gear inches?



 
 
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  #1  
Old May 23rd 17, 06:48 AM posted to rec.bicycles.tech
Sir Ridesalot
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Posts: 5,270
Default Noticeable difference on steep hill 20.3 vs 25.3 gear inches?

So what do you people think?

On a steep hill would there be a noticeable difference between 20.3 gear inches and 25.3 gear inches?

Cheers
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  #2  
Old May 23rd 17, 01:40 PM posted to rec.bicycles.tech
AMuzi
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Posts: 13,447
Default Noticeable difference on steep hill 20.3 vs 25.3 gear inches?

On 5/23/2017 12:48 AM, Sir Ridesalot wrote:
So what do you people think?

On a steep hill would there be a noticeable difference between 20.3 gear inches and 25.3 gear inches?



Yes, 20% roughly

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


  #3  
Old May 23rd 17, 04:11 PM posted to rec.bicycles.tech
(PeteCresswell)
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Posts: 2,790
Default Noticeable difference on steep hill 20.3 vs 25.3 gear inches?

Per Sir Ridesalot:
On a steep hill would there be a noticeable difference between 20.3 gear inches and 25.3 gear inches?


Maybe not for a fit rider...

But, for the likes of me, that is approximately two shifts on my Rohloff
and I can feel it easily.
--
Pete Cresswell
  #4  
Old May 23rd 17, 06:33 PM posted to rec.bicycles.tech
[email protected]
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Default Noticeable difference on steep hill 20.3 vs 25.3 gear inches?

On Tuesday, May 23, 2017 at 12:48:12 AM UTC-5, Sir Ridesalot wrote:
So what do you people think?

On a steep hill would there be a noticeable difference between 20.3 gear inches and 25.3 gear inches?

Cheers


Yes. Putting numbers into a gear chart gets you 25.4 gear inches with a 24x25 gear. And 19.9 gear inches with a 24x32 gear. Get a loaded touring bike with a triple crank and 74mm bcd inner chainring. 24 tooth. Then ride up a hill, loaded with panniers, with a low gear of 24x25. Then repeat with a low gear of 24x32. You will notice the difference if the hill is steep enough to require the 24x32 low gear. Most people can easily tell the difference between a 25 and 32 cassette cog.
  #5  
Old May 23rd 17, 08:32 PM posted to rec.bicycles.tech
Sir Ridesalot
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Posts: 5,270
Default Noticeable difference on steep hill 20.3 vs 25.3 gear inches?

On Tuesday, May 23, 2017 at 1:48:12 AM UTC-4, Sir Ridesalot wrote:
So what do you people think?

On a steep hill would there be a noticeable difference between 20.3 gear inches and 25.3 gear inches?

Cheers


Addendum

My friend has two bikes. One has a 30 teeth inner ring and the other has a 24 teeth inner ring. He's wondering if a 30 front and 32 rear cog would be that much harder to pedal up a steep hill than what a 24 front chainring and 32 rear cog would be. I thought it'd be noticeable but he's not sure because it's only 6teeth difference on the front. He's read somewhere that it takes a lot more teeth on the front to make a difference than it does on the rear.

Like Andrew said, I think the difference would be big enough to be noticeable although the 30- 32 is 25.3 gear inches and the 24-32 is 20.3 gear inches.

BTW, is the small difference in gear inches between a 30 and 24 chainring with the SAME rear cog the reason most racing tripls have a 30 teeth chainring as their smallest ring?

Cheers
  #6  
Old May 23rd 17, 08:46 PM posted to rec.bicycles.tech
Duane[_3_]
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Posts: 1,900
Default Noticeable difference on steep hill 20.3 vs 25.3 gear inches?

On 23/05/2017 3:32 PM, Sir Ridesalot wrote:
On Tuesday, May 23, 2017 at 1:48:12 AM UTC-4, Sir Ridesalot wrote:
So what do you people think?

On a steep hill would there be a noticeable difference between 20.3 gear inches and 25.3 gear inches?

Cheers


Addendum

My friend has two bikes. One has a 30 teeth inner ring and the other has a 24 teeth inner ring. He's wondering if a 30 front and 32 rear cog would be that much harder to pedal up a steep hill than what a 24 front chainring and 32 rear cog would be. I thought it'd be noticeable but he's not sure because it's only 6teeth difference on the front. He's read somewhere that it takes a lot more teeth on the front to make a difference than it does on the rear.

Like Andrew said, I think the difference would be big enough to be noticeable although the 30- 32 is 25.3 gear inches and the 24-32 is 20.3 gear inches.

BTW, is the small difference in gear inches between a 30 and 24 chainring with the SAME rear cog the reason most racing tripls have a 30 teeth chainring as their smallest ring?

Cheers


I switched from a 53/39 chain ring to a 52/36. With an 11-28T on both,
I can notice the difference on a steep enough climb. How much it
matters is hard to quantify.
  #7  
Old May 23rd 17, 09:09 PM posted to rec.bicycles.tech
Sir Ridesalot
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Posts: 5,270
Default Noticeable difference on steep hill 20.3 vs 25.3 gear inches?

On Tuesday, May 23, 2017 at 3:47:02 PM UTC-4, Duane wrote:
On 23/05/2017 3:32 PM, Sir Ridesalot wrote:
On Tuesday, May 23, 2017 at 1:48:12 AM UTC-4, Sir Ridesalot wrote:
So what do you people think?

On a steep hill would there be a noticeable difference between 20.3 gear inches and 25.3 gear inches?

Cheers


Addendum

My friend has two bikes. One has a 30 teeth inner ring and the other has a 24 teeth inner ring. He's wondering if a 30 front and 32 rear cog would be that much harder to pedal up a steep hill than what a 24 front chainring and 32 rear cog would be. I thought it'd be noticeable but he's not sure because it's only 6teeth difference on the front. He's read somewhere that it takes a lot more teeth on the front to make a difference than it does on the rear.

Like Andrew said, I think the difference would be big enough to be noticeable although the 30- 32 is 25.3 gear inches and the 24-32 is 20.3 gear inches.

BTW, is the small difference in gear inches between a 30 and 24 chainring with the SAME rear cog the reason most racing tripls have a 30 teeth chainring as their smallest ring?

Cheers


I switched from a 53/39 chain ring to a 52/36. With an 11-28T on both,
I can notice the difference on a steep enough climb. How much it
matters is hard to quantify.


Thanks people.

I'm tsaking the guy out for a 60 km ride soon and there are a few pretty steep hills in that area. I figure the 24 teeth chainring bike would be the better choice for him as he's not all that used to steep hills.

I'll show him the replies from here too.

Cheers
  #8  
Old May 24th 17, 07:02 AM posted to rec.bicycles.tech
John B.[_3_]
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Posts: 5,697
Default Noticeable difference on steep hill 20.3 vs 25.3 gear inches?

On Tue, 23 May 2017 12:32:33 -0700 (PDT), Sir Ridesalot
wrote:

On Tuesday, May 23, 2017 at 1:48:12 AM UTC-4, Sir Ridesalot wrote:
So what do you people think?

On a steep hill would there be a noticeable difference between 20.3 gear inches and 25.3 gear inches?

Cheers


Addendum

My friend has two bikes. One has a 30 teeth inner ring and the other has a 24 teeth inner ring. He's wondering if a 30 front and 32 rear cog would be that much harder to pedal up a steep hill than what a 24 front chain ring and 32 rear cog would be. I thought it'd be noticeable but he's not sure because it's only 6teeth difference on the front. He's read somewhere that it takes a lot more teeth on the front to make a difference than it does on the rear.

A 30 - 32 is about 24.7 gear inches. A 24 -32 is about 19.7. If you
were to use the 24 tooth chain ring then a 24 - 26 ratio will be about
the same as a 30 - 32.

--
Cheers,

John B.

  #9  
Old May 24th 17, 07:06 AM posted to rec.bicycles.tech
John B.[_3_]
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Posts: 5,697
Default Noticeable difference on steep hill 20.3 vs 25.3 gear inches?

On Tue, 23 May 2017 13:09:36 -0700 (PDT), Sir Ridesalot
wrote:

On Tuesday, May 23, 2017 at 3:47:02 PM UTC-4, Duane wrote:
On 23/05/2017 3:32 PM, Sir Ridesalot wrote:
On Tuesday, May 23, 2017 at 1:48:12 AM UTC-4, Sir Ridesalot wrote:
So what do you people think?

On a steep hill would there be a noticeable difference between 20.3 gear inches and 25.3 gear inches?

Cheers

Addendum

My friend has two bikes. One has a 30 teeth inner ring and the other has a 24 teeth inner ring. He's wondering if a 30 front and 32 rear cog would be that much harder to pedal up a steep hill than what a 24 front chainring and 32 rear cog would be. I thought it'd be noticeable but he's not sure because it's only 6teeth difference on the front. He's read somewhere that it takes a lot more teeth on the front to make a difference than it does on the rear.

Like Andrew said, I think the difference would be big enough to be noticeable although the 30- 32 is 25.3 gear inches and the 24-32 is 20.3 gear inches.

BTW, is the small difference in gear inches between a 30 and 24 chainring with the SAME rear cog the reason most racing tripls have a 30 teeth chainring as their smallest ring?

Cheers


I switched from a 53/39 chain ring to a 52/36. With an 11-28T on both,
I can notice the difference on a steep enough climb. How much it
matters is hard to quantify.


Thanks people.

I'm tsaking the guy out for a 60 km ride soon and there are a few pretty steep hills in that area. I figure the 24 teeth chainring bike would be the better choice for him as he's not all that used to steep hills.

I'll show him the replies from here too.

Cheers


the nice thing about small chain rings is that one can almost always
find a higher gear, it is always finding a lower gear that is the
problem :-)

--
Cheers,

John B.

  #10  
Old May 24th 17, 02:37 PM posted to rec.bicycles.tech
Joerg[_2_]
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Posts: 6,016
Default Noticeable difference on steep hill 20.3 vs 25.3 gear inches?

On 2017-05-23 13:09, Sir Ridesalot wrote:
On Tuesday, May 23, 2017 at 3:47:02 PM UTC-4, Duane wrote:
On 23/05/2017 3:32 PM, Sir Ridesalot wrote:
On Tuesday, May 23, 2017 at 1:48:12 AM UTC-4, Sir Ridesalot
wrote:
So what do you people think?

On a steep hill would there be a noticeable difference between
20.3 gear inches and 25.3 gear inches?

Cheers

Addendum

My friend has two bikes. One has a 30 teeth inner ring and the
other has a 24 teeth inner ring. He's wondering if a 30 front and
32 rear cog would be that much harder to pedal up a steep hill
than what a 24 front chainring and 32 rear cog would be. I
thought it'd be noticeable but he's not sure because it's only
6teeth difference on the front. He's read somewhere that it takes
a lot more teeth on the front to make a difference than it does
on the rear.

Like Andrew said, I think the difference would be big enough to
be noticeable although the 30- 32 is 25.3 gear inches and the
24-32 is 20.3 gear inches.

BTW, is the small difference in gear inches between a 30 and 24
chainring with the SAME rear cog the reason most racing tripls
have a 30 teeth chainring as their smallest ring?

Cheers


I switched from a 53/39 chain ring to a 52/36. With an 11-28T on
both, I can notice the difference on a steep enough climb. How
much it matters is hard to quantify.


Thanks people.

I'm tsaking the guy out for a 60 km ride soon and there are a few
pretty steep hills in that area. I figure the 24 teeth chainring bike
would be the better choice for him as he's not all that used to steep
hills.

I'll show him the replies from here too.


It also depends on his age. I used to climb steep hills in Eastern
Belgium using a corncob cassette because that's all that was available
back then. 42-21 was the lowest gear. No problem. Fast forward 35 years,
similar hills in California and I had to walk some of them. Then I
hacked an MTB cassette and that got me down to 42-28. Still huffing and
puffing on some hills and after installing 42-32 it's now very
manageable. The difference between the 28 and 32 sprockets in the back
can be a profuse sweat versus easy spinning.

60km is a normal errand run to the valley for me. When getting back up
the foothills at the end with some load on the bike that 32T sprocket
sure is a relief on some of the hills.

--
Regards, Joerg

http://www.analogconsultants.com/
 




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