thunderstorm80
1 kW
- Joined
- Mar 29, 2016
- Messages
- 383
Hi,
I have just finished a new E-fatbike build, which uses Crystalyte TC4080 as the front motor.
Let's put a side the front/rear discussions and why I chose the TC4080 - I want to focus on the tire pressure:
The tires are Surly black floyd 26x3.8 (or more closer to 4.0) on 80mm rims.
The max pressure is indicated on the tyre as 30PSI.
The bike is intended for urban commuting, and I chose Fat-Bike as we have many deep pot-holes and as I need to get off/on sidewalk crossings alot which I would like to pass without coming to a near-stop every time.
I started riding with 15PSI - The tire was quite stiff and bouncy and I felt it's still too much for going on/off sidewalks without coming to a near stop.
I lowered to 9-10PSI: At this point the cushioning was perfect, but the rolling drag has became significant, as expected. Also the self-steering, with the added rotating 9kg motor mass became very noticeable, but I don't care. My goal is the cushion and the suspension. (You can damage a standard MTB motorized-rim (with standard 2inch+ tires and with a 9KG motor) when you jump on/off sidewalks, even if you use full-suspension bike, since the weight of the motor sits below the suspension(s) so it's unsprung weight)
My question is how low can I get with the pressure, without causing increased wear and tear on the tire?
At 9-10PSI the tire is already "audible" - you can actually hear the drag, but I am still very far from squishing it to be even close to the rim, which means I can go down more - rim perspective.
The combined weight is around 130Kg, with all the electricity and including loaded panniers.
I have just finished a new E-fatbike build, which uses Crystalyte TC4080 as the front motor.
Let's put a side the front/rear discussions and why I chose the TC4080 - I want to focus on the tire pressure:
The tires are Surly black floyd 26x3.8 (or more closer to 4.0) on 80mm rims.
The max pressure is indicated on the tyre as 30PSI.
The bike is intended for urban commuting, and I chose Fat-Bike as we have many deep pot-holes and as I need to get off/on sidewalk crossings alot which I would like to pass without coming to a near-stop every time.
I started riding with 15PSI - The tire was quite stiff and bouncy and I felt it's still too much for going on/off sidewalks without coming to a near stop.
I lowered to 9-10PSI: At this point the cushioning was perfect, but the rolling drag has became significant, as expected. Also the self-steering, with the added rotating 9kg motor mass became very noticeable, but I don't care. My goal is the cushion and the suspension. (You can damage a standard MTB motorized-rim (with standard 2inch+ tires and with a 9KG motor) when you jump on/off sidewalks, even if you use full-suspension bike, since the weight of the motor sits below the suspension(s) so it's unsprung weight)
My question is how low can I get with the pressure, without causing increased wear and tear on the tire?
At 9-10PSI the tire is already "audible" - you can actually hear the drag, but I am still very far from squishing it to be even close to the rim, which means I can go down more - rim perspective.
The combined weight is around 130Kg, with all the electricity and including loaded panniers.