# Bicycle Tyre Data

Measurement of lateral characteristics of bicycle tyres performed through indoor test-rig VeTyT (Department of Mechanical Engineering, Politecnico di Milano, Milan IT). The test-rig for bicycle tyres complies with the standard ISO 9001-2015.
For further details, refer to the following papers. 

1. Dell’Orto, G., Ballo, F. M., Mastinu, G. (2022). Experimental methods to measure the lateral 	
characteristics of bicycle tyres – a review. Vehicle System Dynamics, 1–23. 	doi.org/10.1080/00423114.2022.214488

2. Dell'Orto, G., Ballo, F. M., Mastinu, G., Gobbi, M. (2022). Bicycle tyres – development of a 	
new test-rig to measure mechanical  characteristics. Measurement, 202, 111813. 	doi.org/10.1016/j.measurement.2022.111813

3. Dell'Orto, G., & Mastinu, G. (2022). Effect of temperature on the mechanical characteristics of bicycle tyres. In _Proceedings of the 10th International Cycling Safety Conference_ Technische Universität Dresden. doi.org/10.25368/2022.473


Raw data are post-processed according to ad-hoc implemented scripts. They were first converted from voltage signal to force [N]. Then, resulting curves have been shifted to erase the systematic error of the measuring devices. 
You can find ready-to-use data for plotting and/or analysis collected into .mat structs and .yaml files (same data, only different format). 
.yaml files have been generated from .mat struct, using .mat scripts available here: https://github.com/ewiger/yamlmatlab.git


File name explanation:
[identifier tyre-rim]__camber__[camber angle]__p__[inflation pressure]

Camber angle: 'meno' stands for negative angles, referred to ISO 8855
Speed of rolling surface: 9.3 km/h
Room temperature ( 24 +- 4 °C )


.mat files are organized as struct.
Files contain the following data:
1. alphaFy [deg]
2. alphaMz [deg]
3. camber_Fy (camber for Fy) [deg]
4. camber_Mz (camber for Mz) [deg]
5. Fy [N]
6. Mz [Nm]
7. Pressure [kPa]
8. Vertical load Fz_Fy [N]
9. Vertical load Fz_Mz [N]

Why do we need to repeat camber, alpha and vertical load Fz both for
lateral force Fy and self-aligning moment Mz? 
because the length of vectors Fy and Mz may be sligthly different, due to 
post-processing.


## Tyre Identifier 

List of tyres tested and identifiers (ID) used to name the data files. 

| Brand      |Serie         	        |Name                   |Dimensions |ETRTO    |ID       |                  
|------------|--------------------------|-----------------------|-----------|---------|---------|                
| Schwalbe   |Balloon       		|Big Ben Plus           |20" x 2,15  | 55-406 |T01      |
| CST        |Brooklyn      		|/                      |20" x 2,15  | 55-406 |T02      |
| Schwalbe   |50km Energizer		|Plus G-Guard 5/Addix-E |28" x 1,75  | 47-622 |T03      |    
| Schwalbe   |50km Energizer		|Active Plus P-Guard 5  |28" x 1,75  | 47-622 |T04      |    
| Scalato    |/        			|Mondano                |28" x 2,15  | 55-622 |T05      |    
| Schwalbe   |/        			|Super Moto-X           |27,5" x 2,40| 62-584 |T06      |
| Mach1 (Rim)|Kargo    			|Disc                   |20"         | 406-25c|T07      |
| Ryde (Rim) |Andra    			|40                     |25"         | 25c-584|T09      |
| Vittoria   |Road Racing/Competition	|Corsa N.ext   		|28" x 26    | 26-622 |T10      |
| Vittoria   |Road Racing/Competition	|Corsa N.ext   		|28" x 28    | 28-622 |T11      |
|Shimano(Rim)|Deore			|HB-M525A   		|28"         | 622    |R01      |