The Richey Outback accepts Accepts 700c x 48mm or 650b x 2" (50.8mm) tires. Frame max spacing 58mm; Fork max spacing 60mm.
Response to my question from Richey: Features rack and fender mounts: With fenders: 700c x 38mm or 650b x 41mm, although with 650b you get some leeway due to the smaller diameter of the wheel. You might find that you can get away with a 650b x 45mm tire and fenders.
Measurements
Hub to crown race = 393mm
Crown race to top of 60mm clearance = 44.2
Hub to top of 60mm clearance = 348.8 (calculation: 393 - 44.2 = 348.8)
650b x 48mm tire radius: 340mm
Top of tire to top of 60mm clearance = 8.8mm
VO Zeppelin
393mm from hub to crown race
minus 44.2 from crown race to 60mm of clearance
393 - 44.2 = 348.8mm (this
348.8 - 340 = 8.8mm (the top of the 60mm clearance is 8.8mm above the tire.
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Velo Orange 650b Smooth Fenders 58mm silver and noir
They're 58mm wide, designed for 650b wheels, and work with tires up to 50mm wide. (The frame max spacing on the Richey is 58mm.
https://www.facebook.com/groups/413046456430213/permalink/737175074017348/
Those are the VO 650b Smooth Fenders, 58mm. Tires are Goodyear Connector Ultimate 50mm and the clearance is very good. I like the fenders and the protection but I will probably add an extra U stay connecting the front part of the front fender to the middle eyelet of the fork for extra stability.
https://www.facebook.com/photo.php?fbid=10159390203220787&set=p.10159390203220787&type=3
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Dear Alexis: I am in the Ritchey Outback FB group. I saw that you fit Velo Orange fenders (58mm 650b) on your Outback. Did you have any difficulty fitting them into the frame or into the fork. Do you have 8mm clearance between the fenders and your 50mm tires? Thanks. Nelson Binggeli
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https://www.facebook.com/photo?fbid=5716535755039150&set=pcb.5716535948372464
Velo Orange Fender Basics
https://velo-orange.com/pages/choosing-fenders
Measuring for Fenders
The basic rule in fender fitting is that the fender should be at least 8mm wider than the tire; 10-12 mm is better.
So if you're running 32mm or 1 1/4" (for 27") tires, get 45mm fenders. If you're running 42mm tires, get 50 or 52mm Fenders. If you're running 48mm tires get at least 56mm fenders (58 or 60 would be better.
A fender's width is measured on the outside, not inside. So to determine if a fender will fit you'll check clearance at the fork crown, and in between the seat stays.
Check the width and height of the fork crown. Finally check that the seat stays are far enough apart and that the brake bridge is at least 10mm above the tire. You may have noticed that I've not mentioned the chain stays. Those are easy because you can always trim the bottom of the fender to clear.
Of course metal fenders are flexible and can be bent, so if the fit is close you can always squeeze the fender in a few millimeters at the offending spot.
It's important to also get fenders of the proper radius. 27" and 700c wheels are close enough to use the same fenders. 650b and 26" fenders are close and some folks do use one size on the other, but you may need to adjust your fender line as the size is close but not identical.
Fender line refers to the fender following the radius of the tire. In other words, the gap between the fender and the tire should be constant along the whole length of the fender. It's one of those things that may not matter much in practice, but it effects the bikes appearance a lot.
As for fender length, that's easy: get the longest fenders possible. Long fenders keep you a lot drier. And if you live in the Northwest, get a mudflap for the front fender too. If you ride brevets or in pacelines, your fellow riders will appreciate a rear flap as well.
They're 58mm wide, designed for 650b wheels, and work with tires up to 50mm wide.
https://sim-works.com/en/news/proper-fender-fit-installation-considerations
First, you need to know your ideal value for sufficient clearance. Simworks recommends 10mm to 15mm depending on the type of bike. More clearance is likely appropriate on touring bikes that are equipped with wide and/or knobby tires and are intended for off-road cycling. Find the best value for your ride and bike style. Error to the side of caution.
Snug fender lines are certainly attractive for setups with tighter clearances, but actual riding can be unnecessarily stressful. These installations are often prone to rubbing. Also, even on dry, paved roads, the sand and pebbles that are often kicked up make a rattling noise. You can reduce these factors by ensuring adequate clearance.
First, figure out the value of your bike’s tire radius. Measure the diameter and halve it, or measure from the hub axle to the outer circumference of the tire. Even if the tire notation shows the same width, various factors such as the presence or absence of knobs, tread thickness, rim width, air pressure, etc. are all factors effecting this value, and the radius changes accordingly. If you can actually measure it, add your ideal clearance value to that value. If the value of the arch radius of the fender is close to that, it means that it should be compatible. There are differences depending on the shape, but an error of a few millimeters can be corrected at the time of installation.
If the fender arches are in good condition, then check the following three clearances- Under the fork crown, under the seat stay bridge, and behind the chain stay bridge. This issue is clear if you can confirm that the fender fits in these points on your frame/fork and that there is enough space for your rotating tires.
Even if there is a gap and it is not enough clearance, you can reduce the tire size (width) to make room and allow it to be installed. For example, lowering 32c to 28c gives a rider an added clearance of 4mm.
Portland Design Works
https://ridepdw.com/blogs/everydaycycling/fitting-your-fenders-a-brief-guide
Some General Rules of Thumb:
(1) In general, you want your fenders to be at least 10mm wider than the widest tire you're going to ride. This is not a hard and fast rule, especially for road bikes which are going to have much tighter fender tolerances. Aesthetics are a big factor here but so is a good/safe fit. The closer the tire width comes to matching the fender width, the more likely you will have rubbing. Will your 700x38 tires work with our 700x45mm fenders? Yes, this will probably be just fine. What about your 700x42mm tires? Now we are getting close to that 45mm fender width and adequate space between your tire and the fender is in question. If the fender is tightly positioned near the tire, you have very little lateral wiggle room. A minor and hardly noticeable wobble in a tire or a slightly out of true rim will be quickly noticeable as rubbing on your fender.
700c tires are larger diameter than 650b tires which are larger diameter than 26" tires. 650b fenders will not work with 700c wheels. 650b and 700c fenders will work with 26" wheels but may not follow the wheel diameter closely (so they'll function but look odd.) 700c fenders will work with 650b wheels but may not follow the wheel diameter closely.
Okay, let's dive into clearances and measurements. Finding the perfect fit will ensure maximum splash coverage from the elements and help you have a worry-free ride. Minimum Clearances
The first measurements to look at are the areas on your bike’s frame and fork where the tire gets close. You can see the minimum distances you’ll need to have for different sizes of fenders on the chart below. If you are willing to bend the fenders a wee bit, you can probably get by with *slightly* tighter tolerances than what we list here.
650B tires, such as the popular 47mm Byway or 48mm Switchback Hill, will have a diameter of about 678-679mm, approximately the same as a 700C x 28mm wheel/tire combo. Here are five useful equivalents:
700C x 23mm = 668mm = 650B x 42mm
700C x 28mm = 678mm = 650B x 47mm
700C x 32mm = 686mm = 650B x 50mm
700C x 35mm = 692mm = 27.5 x 2.1”
700C x 38mm = 698mm = 27.5 x 2.25”
340mm
Ritchey Outback Fork: Max spacing 60mm
393 to top
53mm
Rene Herse: https://www.renehersecycles.com/requirements-for-good-fender-installation
Clearance (required). Some riders manage to squeeze a fender into a 5 mm gap between tire and frame, but ideally, you should have about 30 mm between the tire and the bridges/fork crown. 20 mm (above) is workable, but if you have much less then you are running into safety risks. On some bikes, it may be necessary to switch to narrower tires when mounting fenders.
https://www.youtube.com/watch?v=cVOPV0mEXJM&ab_channel=Henrywildeberry
They're 52mm wide, designed for 650b wheels, and work with tires up to 44mm wide. Rear fender is 120cm long and the front is 90cm long
Watch this video and read the instructions to make sure your frame and fork has the correct mounts and hardware needed.