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IT
needing some nerd help here
I’d love to understand, at a 63.8° head tube angle,
How much reach do I gain if I lower the stem but get a higher riser bar to maintain the Handlebar height the same?
Say now I have the geo as per “after modification”
20mm spacer under the stem, 32mm stem length 35mm rise, 5mm rise extra thanks to the stem
I wonder how much reach I’d gain by lowering the stem with a 50mm riser
At 63.8 degrees head tube angle you will gain about 4.4 mm of reach and loose 9 mm of stack for every 10 mm spacer you remove.
Where you hands actually end up will depend a lot on the sweep and roll of the bars as well.
That’s sick, I had no idea it would change that much, I’ll try a 50mm bar and slamming the stem then I should be on the same bar height but getting 9mm more reach roughly
Nah, that increase in reach is only if your hand height drops. Riser bars bring hand height right back up to where it was, so no change in reach. You could roll your bars forward and channel your inner Goldstone, but that's involving a couple other significant setup factors. No free lunch on this one, unfortunately.
http://yojimg.net/bike/web_tools/stem.php
If you want to adjust your cockpit for more "reach" then the answer is a longer stem. If that sounds unfashionable then feel free to lower your stem and run some higher rise bars rolled forward, which achieves the same thing.
All you achieve by the second option is making your bars less adjustable (because bar roll changes will fuck with your reach more than they used to, and you're forced to run them fairly forward if you want to keep the reach gain you are buying them for).
both options would require buying something, that is't the issue really, it's just that if i can keep the bar height, bar roll and gain reach that way i'd rather do that than getting a longer stem since i don't like stems in the 40mm +
wish there was an add for bar rise
You realise rolling a bar forward is the exact same effect as a longer stem right? Both things move your hands further forward of the steering axis. If you don't like the feel of longer stems then you won't like risers rolled forward either.
sure, but other than looking like an idiot it would feel like shit if i rolled the bar considerably forward, i'm not Goldstone 😅
That was my point, just get a longer stem or don't do it at all.
Bar geometry varies a lot, bars with the same angle of sweep can have very different sweep distances because it depends where the bend in the bar actually is. You might not gain reach, or you might gain too much and have way more of the "long stem" feel than you bargained for. It's trial and error really. If you're happy with your current bar geometry and you're just looking for a "reach" adjust then a new stem is literally the thing that is designed to give you that adjustment.
The only way you can cheat your way out of a long stem feel while adding reach is by getting a reach adjust headset.
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