Seems scary to me. It’s a static answer to a dynamic situation. I could see how 
data of front and rear wheel force loads over a simple ride like my commute 
would be helpful to illustrate. A tire differential presented the topic to me 
yesterday morning.

It’s not the simple weight distribution but the dynamics introduced by braking, 
coming off the seat to get in moving from a stoplight, lateral force from 
initial turn-in, cornering and coming out of turns onto a straight path. 
Terrain of a ride, paved or not, accentuates lots of this.

This was on my mind after coming to my bike after work overnight Thursday and 
seeing the bike next to mine, a fendered  Raleigh Roper, sporting a studded 
front tire while the rear had the everyday 28-ish slick. It made me cringe to 
imagine how really narrow a band of winter riding would be benefitted by that 
expense. That rider hasn’t got the miles to possibly have the skills to gain 
the fraction of a second of traction gain that setup might provide.

https://photos.app.goo.gl/ZCjnutXUaFUW4U357

My bike is in front. The next bike isn’t very well pictured for this 
illustration since I was documenting the increase of riders that 20 degrees 
makes. I was the lone rider and sole bike a day before. See the tractor tire he 
fit up front, the rear was maxed with the skinny 28 under plastic fender.

I would be confused in the very brief moment of benefit those differing tires 
would cause. A time span too short to take advantage of before the bad news is 
delivered and that would be a moment of higher force generated by the front 
tire contact patch that the rear is not able to translate into traction before 
slipping.

Other than on a bike like a Jones with a truss fork designed to run different 
sizes (not tread/slick) mixing tires looks to me like a crash ready to happen.

Andy Cheatham 
Pittsburgh 

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