Another 25t vs 28t thread

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8/15/2020 8:27 PM
Edited Date/Time: 8/19/2020 4:49 AM

I have a 28t sprocket coming in for a new bike build. I’m currently run 25-9 but I thought the 28 might be a little better as it’s sometimes a bit annoying on flat ground. I only really ride my bike in my suburb, but there is a bit of a hill to get home. I can get up it with 25 without zig zagging but only just. I’ve only been riding a few months, so still on the bottom rung for tricks. I do sometimes get knee problems from a bad fracture in my 20s (car vs bike. Nuff said).

I was looking at the colony team bike checks and everyone was running 28t, but back in 2016 it was mostly 25. Kind of weird. Fashion? Changing of riding styles? Bikes getting lighter?

So what do you run? From past threads it looks like people who run 28s swear by them. Has anyone gone up to 28t and given it a good run but eventually gone back to 25t?

What do you run?

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8/15/2020 11:37 PM
Edited Date/Time: 8/15/2020 11:38 PM

I run 28t. I swore by 25t for a couple years without giving 28t a try, but now that I'm on the bigger 28t, I'll never go back. I don't grind/ride street, it's all park and transition for me. I'd like to go 30t one day. I can still climb the moderate hills to and from my local park no problem, if anything it's faster now, haha.

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Scooter kid trying to ride a bike.
@scootereyn

8/16/2020 1:00 AM

I fancy giving a 28 a go. Just got to get around to ordering one.

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8/16/2020 1:16 AM

I like 28 more especially for backwards stuff on a cassette. You get used to it and it feels normal. Right now I’m riding 27/9 cause it put my chainstay length in a better spot for me than a 28t

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8/16/2020 1:35 AM

Be like Trey Jones and run 32-9

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U WOT M9

8/16/2020 2:59 AM

Aussie steez wrote:

Be like Trey Jones and run 32-9

Heh. I looked up the Scotty Cranmer bike check.

That’s one crazy ride.

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8/16/2020 3:18 AM

Aussie steez wrote:

Be like Trey Jones and run 32-9

Dr Sarcophagus wrote:

Heh. I looked up the Scotty Cranmer bike check.

That’s one crazy ride.

Is that the chrome hyper frame?

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U WOT M9

8/16/2020 3:45 AM

Not quite!

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8/16/2020 4:00 AM

Dr Sarcophagus wrote:

Not quite!

Yeah i thought you meant Scottys bike but treys bike is crazy. I like how the chrome forks and bars go with the rusty frame, it actually goes really well

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U WOT M9

8/16/2020 4:01 AM

Dr Sarcophagus wrote:

Not quite!

Aussie steez wrote:

Yeah i thought you meant Scottys bike but treys bike is crazy. I like how the chrome forks and bars go with the rusty frame, ...more

Yeah. It looks awesome. Very not average.

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8/16/2020 4:40 AM

I’m 30/9 and can get up hills and stuff just fine. Rode 25 for a few years, went 28/9 when I was 17 and loved it, I’m 26 now and I wouldn’t even consider going back down to 25, 30 if I can squeeze it and 28 if I can’t!

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8/16/2020 7:58 AM

Something to consider is tire size also..

I think running 25/9 with 2.5 tires is the same as, running 28/9 with 2.0 tires.

Math would tell the truth on that^ but I wouldn't know where to begin on the math..

Also crank arm length will ultimately affect the feel of your gear ratio.

I'm running 25/9, 2.5 tires, 160mm cranks..

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It is not because things are difficult that we do not dare, it is because we do not dare that they are difficult: Seneca

8/16/2020 9:32 AM

25/9 because my backend is slammed and unless the shadow chain breaks I'm not about to deal with adjusting the chain for as long as I can

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8/16/2020 1:54 PM

Black Swamp Ghost wrote:

Something to consider is tire size also..

I think running 25/9 with 2.5 tires is the same as, running 28/9 with 2.0 tires.

...more

I hadn't given much thought about this, but that's a good point and you got me curious. I measured a couple tires/ wheels I have laying around. Nothing exact, just eyeballing it with a tape measure. I have an Arisun 1.95 at 20-1/8 outside diameter, a Demolition 2.25 at 20-1/2, and an Animal 2.4 at 20-7/8. It's actually a bigger difference than I expected. I figured a half inch difference in width would correspond to a half inch or so in diameter, and it is about 50% more than that. This of course is an apples to oranges comparison because of the different brands, but I figure it's enough to get a general idea.

That said, 20-7/8 is less than 4% bigger than 20-1/8, which would correspond to about a one tooth change on the front sprocket. A 2.5 will be even a little bigger in theory, so I would guess it might be similar to at least a 26/9 with a 2.0 tire. I suppose it's enough of a difference to be worth taking into consideration when changing or buying sprockets and/ or tires.

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8/16/2020 2:25 PM

Black Swamp Ghost wrote:

Something to consider is tire size also..

I think running 25/9 with 2.5 tires is the same as, running 28/9 with 2.0 tires.

...more

upnsmoke wrote:

I hadn't given much thought about this, but that's a good point and you got me curious. I measured a couple tires/ wheels I ...more

That’s really interesting. Thanks for working out the math. I run a 2.25 front and back and don’t really see myself going any bigger. But I also run fairly low pressure so it didn’t seem to make much difference when I switched from the 2.4s.

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8/16/2020 5:12 PM

28/9 gear ratio
2.4 tyres
160mm cranks

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Noah Farver

717-679-7588 Text me if you need me.

[LINK TO IMAGE]

8/16/2020 5:24 PM

2.25'' tires on XL rims
175mm cranks
25-9 ratio

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8/16/2020 5:33 PM

Interesting. At this point the poll has an even split between 25t and bigger than 25t. I expected more 25s given that’s what’s included with most completes.

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8/16/2020 7:27 PM

I'm the guy you are looking for. My first complete bike (2008/09 specialized, can't remember the exact year) came with a 25/9. I rode 25/9 until about 2011 when I got a 28T and I LOVED the change. Much easier to get speed, and you don't feel like you are a hamster in a hamster wheel when pedaling at speed. Also, it made fakies more comfortable to do, as you weren't doing the "reverse hamster."

Come to 2018. . . I broke my Madera spine drive cranks and had the hardest time getting my 28T S&M spline drive sprocket off the old spindle. Once it was off, I couldn't for the life of me get it on my new Premium 1948 crank spindle. The spines just weren't compatible. I gave up, and used the 25T sprocket that came with the Premium 1948 cranks so I could get a working bike again.

So, now that I've been back on 25T for a minute, I still prefer 28T. I like to go fast-ish, and 28T is a comfortable ratio for speed. I honestly can't think of anything I like better about the 25T, I just run it because I hate dealing with spine drive garbage, and the 1948 cranks don't have a bolt hole for a sprocket.

So, if anyone wants a used 28T gold S&M sprocket, HMU!

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8/17/2020 9:51 AM

^Damn, it's messed up you're stuck with the 25T when you don't like it as much. If it's a proprietary spline size, I wonder if Premium at least has different size sprockets? Haven't seen a lot of Specialized Bmx' around. I couldn't help being curious and looked it up. They were nice looking frames.

While I'm at it, I forgot to answer the original question. OP, 2.25s are my go to tire lately, too. My ideal gear is 28/9. Lately I have been spending most of my time on a Fit VHS with 175mm? cranks and 27/9s just because I wanted a blue sprocket and happened to find a good deal on a 27T. It's really not that big a difference from 25/9 on paper, but I feel like with 25/9 I it takes me too many cranks to get up to speed when I have limited space, while that's not so much a problem with the longer gear, if that makes sense.

Otherwise, I figure if I can't make it up a hill with 28/9, I probably wouldn't have made it with 25/9 either, or would have been slow enough I may as well get off and walk anyway. It's funny, the mid school Hoffman I ride when I'm not on the the Fit has 39/13s, which are exactly the same ratio as 27/9. I mostly just cruise on the Hoffman, so I'm not really worried about the big drivetrain. The extra gear is nice for pedaling up to speed then sitting and resting. I have an old 42T Profile sprocket I've thought about throwing on just to try. That would give me the same ratio as 29/9.

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8/17/2020 10:21 AM

28x9 right now. I have 31t that I am looking forward to trying out.

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8/17/2020 10:21 AM

28t

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8/17/2020 11:32 AM

28/9 2.30 tires and a freecoaster

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I believe in hub guard protection

8/18/2020 7:56 AM

28 tooth just fitted just need the rain to go away then i can try it. Photo

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8/18/2020 10:24 AM

28/9.

Just got my hands on a 28T Skworl Nutcracker guard sprocket. Pumped.

This is a promo for it.

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"Hey anybody ever make that mistake like right when you wake up in the morning and you believe in yourself?" -Kyle Kinane

"BIKES!" -Tom Segura

8/18/2020 5:47 PM

Alright just built up a second bike and had to go 28/9 to squeeze it. So now I’m half 30/9 or you’re a pussy, and half 28/9 which makes me a little bit of a pussy.

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8/18/2020 8:32 PM

I think I’m just about convinced to get the 28. The only time I think it’s a bad idea is on that last hill home

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8/18/2020 8:35 PM

Dr Sarcophagus wrote:

I think I’m just about convinced to get the 28. The only time I think it’s a bad idea is on that last hill home

Sprockets are relatively inexpensive..

Give it a shot! The worst part about going to a bigger sprocket is you have to either add links to your chain, or get a new chain..

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It is not because things are difficult that we do not dare, it is because we do not dare that they are difficult: Seneca

8/18/2020 8:51 PM

It’s for a new build so I’ll be replacing the chain anyway. And the 28t is already ordered, so I’d need to return it to get the 25t.

I’m surprised so many more people run 28t - or more to the point, surprised most (all?) completes still come with 25t.

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8/18/2020 9:10 PM

In flatland, they get smaller than 25 too..

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It is not because things are difficult that we do not dare, it is because we do not dare that they are difficult: Seneca