12/24/2022 0 Comments Mtb geometry calculator![]() I’m comfortable riding 35-55mm stems, beyond that I think they start to change personality too much. Let’s call that a Rider Stack of 688.59mm and Rider Reach of 451.1mm.īut, so what? Well, what it means is I (we’re going to come back to seat tube angle later so hang on for now) could fit on a bike with notably shorter reach if it had a taller stack. ( Triangle Calculation – opens in new window) So, 70.1mm added, at 65.5 degrees means my stack increased 63.79 while my reach decreased 29.1mm. 9.5mm of headset height, 20mm of stem spacer, then add half of the height of the stem 20.6mm, finally the 40mm bar rise (let’s leave out sweep for this). Well I run my cockpit pretty tall on this bike. ( link to ’s Triangle Calculation for this opens in new window) You also shorten the reach 4.15mm for every 10mm increase. Using the headtube angle 65.5, every 10mm spacer or bar rise increase raises stack 9.1mm. I’m going to use my Large SB130 Lunch Ride’s listed geo for an example (partly as I’m really interested in why this, the “longest” bike I’ve owned handles more nimbly than anything I’ve had in my quiver… much more to come on that). If you’re like me, the taller cockpit keeps you in a position you can pedal the bike too (back issues).ĭue to the headtube angle the taller you make the cockpit the further rearward it moves the controls. ![]() The taller cockpit gives a rider greater support and leverage particularly in steep terrain. It’s likely that you’re running 5-20mm of stem spacers. Somehow lost along the way: these aren’t “independent” dimensions. Stack is the vertical measurement between center of BB and center point of headtube. Reach is the distance horizontally between center of bottom bracket and the center point of the headtube. They were designed to simplify the concept a bit. That’s where Reach (M) and Stack (L) came into play several years ago. Most of it is exceptionally dependent on each other in order to “make sense”. When you look at an MTB geo chart you’re going to see a lot of data. To understand why reach isn’t the “be all and end all” let’s examine variables that muddy the waters. In order to keep things readable, and the SEO robots happy we’re going to break this up. Teaser: As we examine how variable some geo numbers can become I believe it will shed light on how critical suspension design and application really are. ![]() I’d like to take a few posts and explore some of the various balancing acts that go on to produce a great fitting MTB geo. Exploring MTB Geometry you’ll see that reach is far more malleable than you might have thought. But what makes an ideal MTB geo? Well, if you’re listening to some of the “influencers” it’s reach, reach and reach… Except it’s not nearly that simple. ![]() We often talk about a bike’s cutting edge geometry. ![]()
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