20.8 vs 21.1" TT

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7/14/2018 2:18 AM
Edited Date/Time: 7/14/2018 3:10 AM

I'm looking for a new frame and one of my top picks has come up on eBay at a very good price, the only downside is that it's a 21.1" TT and I'm 5' 8"ish. My current frame is 20.1" with 13.5" chainstays which feels far too short hence the search for a new frame. I've ridden a friends 21" WTP Envy which felt very stable and I could still spin easily, but I didn't have the chance to ride it very much.

Spins don't seem to be an issue with the longer TT, if anything I found them a little easier. I have to throw my weight more but the extra stability makes up for it in confidence.

Any other short guys running a 21" TT? Are there other tricks than spins that will be harder? How are nose manual tricks and could fork offset make up for this? The frame I'm looking at has a 13.2" rear end and 69 ST angle which I'm thinking will help a little and I'd be saving myself a considerable amount of money over buying new.


7/14/2018 4:19 AM

This frame you are looking for seem to be a BSD passenger, keep in mind the 69° seat angle will shorten your tt lenght around ~0.25" compared to a classic 71° angle, so the 21.1" is a 20.8"/.9" for real.

Long tt is the way to go, stable and roomy with a mid/short backend to keep it easy to throw around.


7/14/2018 4:32 AM

Francky wrote:

This frame you are looking for seem to be a BSD passenger, keep in mind the 69 seat angle will shorten your tt lenght around ...more

Just realised I didn't mention it but yes it's a Passenger. Cheers, I thought that might be the case. Still quite new to working out how geo effects certain things, I've been on my current frame since 2011!

More space but still responsive is exactly what I'm looking for. I'm a bit of a wimp so I prefer slower tech tricks than hucking it, but I just feel cramped on 20.1" when I want to flow around a park or want to hit some big bowls once in a while.


7/14/2018 5:11 AM
Edited Date/Time: 7/14/2018 9:59 AM

TT is entirely personal preference but I'd say to go for the 20.8. I'd say there's no need for anything longer unless you're like 6'5 and I've always found 21"+ TTs make the bike feel really sluggish and horrible.

Edit: Didn't look at the ST angle, the 21.1 should be fine.


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7/14/2018 7:45 AM

5'9 and currently on 20.6 and just ordered a 20.4 again

21 is way too big imo. Unless you're tall.


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7/14/2018 8:06 AM

Francky wrote:

This frame you are looking for seem to be a BSD passenger, keep in mind the 69 seat angle will shorten your tt lenght around ...more

This. The effective toptube will be closer to a 20.8ish


7/14/2018 8:29 AM
Edited Date/Time: 7/14/2018 8:29 AM

Think I'm going to go for it, I was considering the 20.8 originally as out of other bikes I've tried, around that seems to feel best, but those frames also had steeper ST angles. Worst case scenario I can sell if it if doesn't feel right and make my money back.


7/14/2018 8:41 AM

21.1" w/ 69STA = 20.85 w/ 71STA

Go for it.


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7/15/2018 8:53 AM

I've had passengers in this both these sizes
Prefer the 20.8 honestly


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