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Chainring upgrade?

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Chainring upgrade?

Old 06-03-18, 11:45 AM
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Chainring upgrade?

I'm currently using a 48t chain ring and a 16t cog on the rear. I use my single speed to commute to work and I'm finding that on the long straights i don't feel like i can go any faster which is really annoying.

Looking to go to a 58t chainring but is it wise to go this high?
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Old 06-03-18, 01:42 PM
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No.
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Old 06-03-18, 04:25 PM
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Yeah, that's a pretty big gearing change. 58x16 works out to about 95 gear inches, which is crazy for anyone not racing. Maybe try going down one or two teeth on your cog - cogs are cheaper than chainrings and also won't require you to buy a new (i.e., longer) chain.

As a side note.. how fast are you going, and how fast are you pedaling, that you feel like you can't go faster? Your current gear will have you pedaling around 110 rpm at 25 mph. How much faster are you trying to go?
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Old 06-03-18, 07:29 PM
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Do it
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Old 06-03-18, 07:36 PM
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Originally Posted by dayvurd View Post
I'm currently using a 48t chain ring and a 16t cog on the rear. I use my single speed to commute to work and I'm finding that on the long straights i don't feel like i can go any faster which is really annoying.

Looking to go to a 58t chainring but is it wise to go this high?
No way.

I just calculated where that would put me in my array of gear combinations, had to calculate a second time to make sure I wasn't mistaken. I can't imaging having to start out at a light in traffic, or head up an incline at that gearing.
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Old 06-04-18, 01:47 AM
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Originally Posted by phobus View Post
Yeah, that's a pretty big gearing change. 58x16 works out to about 95 gear inches, which is crazy for anyone not racing. Maybe try going down one or two teeth on your cog - cogs are cheaper than chainrings and also won't require you to buy a new (i.e., longer) chain.

As a side note.. how fast are you going, and how fast are you pedaling, that you feel like you can't go faster? Your current gear will have you pedaling around 110 rpm at 25 mph. How much faster are you trying to go?
So I've got about a 2 mile stretch of straight road. Its where i love to give it the beans.

The only way that i can describe it is that when I'm going fast, my legs are spinning without any resistance, as in my peddling isn't doing anything.
I want to be able to still have a stiff rotation at full speed on the straights and i feel like my current gear isnt cutting what i want.

So thats why im looking to go bigger
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Old 06-04-18, 02:59 AM
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Pedal faster.
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Old 06-04-18, 03:49 AM
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Serious answer: try a bigger gear if you want. Maybe get a 15t cog. A 58t chainring would just be ridiculous and likely wouldn't fit your frame.
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Old 06-04-18, 09:13 AM
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https://www.bikecalc.com/cadence_at_speed

Found this pretty interesting. Maybe 54 would be middle ground of what im after
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Old 06-04-18, 03:16 PM
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Changing the cog/freewheel in the back would be cheaper
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Old 06-04-18, 04:30 PM
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Old 06-04-18, 05:47 PM
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Dropping from a 16t to a 15t in the rear would be a 7% higher gear.

You could try it for less than $10.
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Old 06-04-18, 06:58 PM
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Originally Posted by dayvurd View Post
So I've got about a 2 mile stretch of straight road. Its where i love to give it the beans.

The only way that i can describe it is that when I'm going fast, my legs are spinning without any resistance, as in my peddling isn't doing anything.
I want to be able to still have a stiff rotation at full speed on the straights and i feel like my current gear isnt cutting what i want.

So thats why im looking to go bigger
And this is downhill, right?
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Old 06-04-18, 07:28 PM
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A 58T would look pretty ******. I'd need a 21T cog to make my gearing work out, though.
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There's no such thing as too far.. just lack of time
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Old 06-04-18, 08:08 PM
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Since the OP is in England, home of the FG/TT specialists, asking locals about how to go really fast would be appropriate:

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Old 06-04-18, 08:17 PM
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Originally Posted by Bandera View Post
Since the OP is in England, home of the FG/TT specialists, asking locals about how to go really fast would be appropriate:

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Love that website. It's what taught me that you can (probably) always wring more out of a medium gear.
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Originally Posted by chandltp View Post
There's no such thing as too far.. just lack of time
Originally Posted by noglider
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Old 06-05-18, 02:40 AM
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Originally Posted by phobus View Post
And this is downhill, right?
No this is level ground
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Old 06-05-18, 03:07 AM
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Originally Posted by dayvurd View Post
No this is level ground
What size wheel?

If its a standard 700CX25MM tire, a 3:1 ratio is going to be difficult for most people to spin out completely on flat ground without any wind break. (for me that would be 60kph or somewhere around 165-170RPM @ 48X17T)

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Old 06-05-18, 05:29 AM
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Originally Posted by SHBR View Post
What size wheel?

If its a standard 700CX25MM tire, a 3:1 ratio is going to be difficult for most people to spin out completely on flat ground without any wind break. (for me that would be 60kph or somewhere around 165-170RPM @ 48X17T)

yep 700x25 is my wheel size.
and this map is my route


so this is the exact route im talking about on my way to work. its 2.2 Miles 3.5KM for you metric folk. it is mostly flat according to google maps.
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Old 06-05-18, 05:34 AM
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Originally Posted by TimothyH View Post
Dropping from a 16t to a 15t in the rear would be a 7% higher gear.

You could try it for less than $10.
id not even thought about that, definitely worth a try. one side of my hub is empty at the moment so it would be nice to be able to turn my bike wheel around and have higher gear
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Old 06-05-18, 07:11 AM
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I'm really curious to know what speed and cadence you're at that you feel like you're spinning out a 48x16 without any resistance. You're either a god among cyclists or your definition of fast and spinning out are way different than mine.
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Old 06-05-18, 07:38 AM
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Originally Posted by phobus View Post
I'm really curious to know what speed and cadence you're at that you feel like you're spinning out a 48x16 without any resistance. You're either a god among cyclists or your definition of fast and spinning out are way different than mine.
*shrugs* me either. Next time im on route ill see if i can record it and post it here.
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Old 06-05-18, 08:51 AM
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48:16 is a pretty high gear for the road. A higher gear isn't necessarily going to help you sustain a higher speed. If you want to go fast, you need to learn to spin.
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Old 06-05-18, 10:14 AM
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Originally Posted by mihlbach View Post
48:16 is a pretty high gear for the road. A higher gear isn't necessarily going to help you sustain a higher speed. If you want to go fast, you need to learn to spin.
Care to elaborate what a "spin" is?
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Old 06-05-18, 10:28 AM
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Originally Posted by dayvurd View Post
Care to elaborate what a "spin" is?
If you can't maintain 100 RPM in a flat time trial with 120 on demand on your "course" you are plodding, not spinning.
Look at the times in the Medium Gear TT linked.
24:23 for 10 miles on a 72" gear is spinning.

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"Below is a table giving your speed in mph for a given gear size and pedal rpm. I have selected a range of gears and rev's which should cover most peoples needs,"

Untitled Document


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