Originally Posted by
busdriver1959
The pivot point on your setup is the rear axle. I think the actual pivot point would be the rear tire contact patch. I've had a couple glasses of wine. I can't really figure out if that's correct or what the effect would be between your setup and mine with a block under the front wheel.
Right; the wheelbase would clearly affect the HTA with a change in axle-to-crown. The change in HTA with a smaller frame/shorter wheelbase would be greater than for a larger frame/longer wheelbase. The frameset I used and measured a 0.2° HTA difference is a 22" c-t frame size I happened to have in the brackets. The small size makes the HTA delta greater than if it were a larger frame..