Schwalbe Marathon Racer mounted width

[Rob Johnston]

I would like to know the mounted width of these Schwalbe
Marathon Racer tires: 30mm and 35mm.

I am looking for the widest tire for a tandem for lightly loaded
touring, total weight of 350 lb. (bike, riders, gear.) I have limited
fork clearance -- a 35mm Panaracer Tourguard leaves only 3 mm clearance
to the center of the fender.

Thanks for the help,
Rob Johnston
Albion Maine USA

[Rob Johnston]

Jan wrote:
> We tested the 30 mm Marathon Racer, and found that it measured 28 mm
> on a 19 mm-wide Mavic MA-2 rim.

Could you speculate how wide that would be on a Mavic 520
(wider) rim?

Any opinions on plusses and minuses of Marathon Racer compared
to Marathon Supreme and to Panaracer Tourguard?

Thanks,
Rob Johnston

> -----Original Message-----
> From: Jan Heine [mailto:hei...@earthlink.net]
> Sent: Wednesday, March 10, 2010 2:29 PM
> To: Rob Johnston; randon digest subscribers
> Subject: Re: [Randon] Schwalbe Marathon Racer mounted width

>
> At 2:09 PM -0500 3/10/10, Rob Johnston wrote:
> > I would like to know the mounted width of these Schwalbe
> >Marathon Racer tires: 30mm and 35mm.
>

> We tested the 30 mm Marathon Racer, and found that it measured 28 mm
> on a 19 mm-wide Mavic MA-2 rim.
>
> Jan Heine
> Editor
> Bicycle Quarterly
> 2116 Western Ave.
> Seattle WA 98121
> http://www.vintagebicyclepress.com

[Rob Johnston]

Jan,
Thank you. This is helpful.

Rob

> -----Original Message-----
> From: Jan Heine [mailto:hei...@earthlink.net]
> Sent: Wednesday, March 10, 2010 4:51 PM
> To: Rob Johnston; randon digest subscribers

> Subject: RE: [Randon] Schwalbe Marathon Racer mounted width

>
> At 4:24 PM -0500 3/10/10, Rob Johnston wrote:
> >Jan wrote:
> >> We tested the 30 mm Marathon Racer, and found that it measured 28
> mm
> >> on a 19 mm-wide Mavic MA-2 rim.
> >
> > Could you speculate how wide that would be on a Mavic 520
> >(wider) rim?
> >
> > Any opinions on plusses and minuses of Marathon Racer compared
> >to Marathon Supreme and to Panaracer Tourguard?
>

> Tires vary too much from batch to batch to give exact widths. You
> really need _enough_ clearance that a millimeter or two don't matter.
>
> As far as performance goes, the Marathon Racer is the only tire from
> the Marathon family that I have ridden which wasn't totally sluggish.
> Our roll-down tests showed it faster than it felt...
>
> I prefer the Paselas, because they ride more like a high-performance
> tire. Of course, I ride our Grand Bois tires, but those are in
> another league. I look forward trying them on the tandem, if I ever
> get that old Jack Taylor back on the road.

[Ingle, Bruce]

Topic: Re: Schwalbe Marathon Racer mounted width

>> We tested the 30 mm Marathon Racer, and found that it measured 28 mm
>> on a 19 mm-wide Mavic MA-2 rim.

> Could you speculate how wide that would be on a Mavic 520
> (wider) rim?

Circumference is pi times diameter and the rim forms a part of the
circumference, so the mounted tire should get about a millimeter wider
for every three (ie, pi) millimeters the 520 is wider than the MA2 (e.g.
1mm wider for ~22mm rim width, 2mm for ~25mm, etc.).

This is a pretty gross approximation, but it should be good enough.

- Bruce