Click on the links to see instructions.
How wide a tire will fit my bike?
- Check out our post on measuring clearances on your bike.
- The optimum tire pressure depends on your tire width, your weight, the terrain and your riding style. Determine the best tire pressure by experimenting what feels right. Use our Tire Pressure Calculator as a starting point.
- The minimum pressure of your tire depends on your weight, so we don’t list a minimum pressure for Rene Herse tires. More information about minimum pressure is available here.
Tubeless or tubes?
- Many Rene Herse tires are tubeless-compatible. This means they can be set up tubeless (with a sealant) or used with tubes.
- Tubeless setup reduces the risk of pinch flats, which can be useful when riding at high speeds across rough terrain. Disadvantages of tubeless mounting are the more difficult setup and closer rim tolerances required to prevent blow-offs. What about performance? The sealant inside tubeless tires cancels out the gains from eliminating the tube: Tubeless tires roll as fast as tires with tubes.
- If you are leaning toward tubeless tires because you are concerned about punctures, you can use sealant inside your inner tube. (The tubes we sell have removable valve cores.) More information is in our Tubeless Tire FAQ.
How much sealant?
- With supple tires, sealant is required to seal the tire against the rim. Make sure to use enough sealant. We recommend the following amount of sealant, based on the width of your tires:
- 25 – 32 mm: 60 – 90 ml (2 – 3 oz.)
- 35 – 42 mm: 90 – 120 ml (3 – 4 oz.)
- 44 – 55 mm: 120 – 150 ml (4 – 5 oz.)
- Make sure to replenish the sealant at least once a month, as it tends to dry out.
Hard to mount
- Push the tire bead into the ‘well’ in the center of the rim all around the tire, and make sure it’s not caught on the ‘shelf’ near the edge of the tire. The tire bead does not stretch much, so it needs to be in ’well’ to give you enough slack to lift it over the rim sidewall. You can also lubricate the tire bead with soapy water to make the tire easier to seat. For step-by-step photo instructions, check out our Tire Instructions (linked at the top of this page).
My tire seems narrower than it should be.
- How wide your tire ultimately ends up depends on the rim width, your casing, your inflation pressure, and whether you run the tire with tubes or tubeless. To seat your tire correctly and pre-stretch the casing, inflate the tire to the maximum pressure (of your tire or your rim, whichever is lower) and let it sit for 24 hours. The tire will stretch and ‘grow’ a bit more as you use it. Remember that the suppleness of the casing is more important for comfort and speed than a millimeter or two in width. Read more…
Tubeless tire blew off
- When a tire blows off the rim, it’s usually because the rim is slightly undersize or the sidewall (G height) is not tall enough. Unfortunately, not all rims meet the current ETRTO / ISO specs. Even if the rim worked with your previous tires, supple tires require tighter rim tolerances than tires with stiff sidewalls. Read this entry in the Rene Herse Journal for more information and a list of rims with their measurements.
- In many cases, the problem can be solved by building up the rim bed with extra rim tape. Some mechanics use thicker Gorilla Tape to build up the rim bed. The tire should have a slightly tight fit on the rim. If large bursts of air from a compressor are required to seat the tire, air is escaping between tire and rim bed. That is often a sign that the rim is undersize. Don’t mount the tire like this: Build up the rim bed with extra tape to reduce the risk of the tire blowing off the rim. When in doubt, check with the rim maker that their rim meets the ETRTO / ISO standards. Click here for our step-by-step photo instructions on how to set up tires tubeless.
Losing air (tubeless)
- Supple casings make tires fast and comfortable because they flex easily. This means that they can contact the rim in a few places, and have tiny air gaps in others – making them harder to mount and seal tubeless. It is important to work methodically and get sealant into all the tiny air gaps, on each bead (both sides of the tire). Simply pouring in sealant and going for a ride is often not enough. Click here for our step-by-step photo instructions on how to set up tires tubeless.
- If you have followed these instructions, and your tire is still losing air, there may not be enough liquid sealant inside. Sealant needs to be replenished monthly, as it tends to dry out.
Losing air (tubes)
- Sometimes, the valve core of inner tubes isn’t screwed in all the way at the factory. This can happen with all brands of tubes, including the tubes we sell. Before installing an inner tube, make sure the valve core is screwed in all the way. Use a valve core tool or a small adjustable wrench on the flat sections of the valve core, just under the locknut.
- Flat tires are no fun, especially if you have several on the same ride. Check to make sure you’ve removed the debris that caused the flat. If a steel wire, glass shard or rock splinter is stuck in your tire, it’ll puncture your new tube, again and again. Sometimes, the object is hard to find, if it’s embedded in the tread and only protrudes when the tire flexes under the rider’s weight. Other tips to reduce flats are:
- Run lower pressures. A softer tire rolls over most debris without getting punctured. (Wider tires allow running lower pressure without compromising safety.)
- Choose your route (as much as possible): shoulders of busy highways in particular are full of debris that can cause flats. Punctures are rarer on backroads (paved or gravel).
- Run a reinforced casing like our Endurance or Endurance Plus that protects against many punctures.
Leaking through sidewalls (tubeless)
- We have found that Panaracer Smart Seal greatly reduces the risk of tires leaking through their sidewalls. Other sealants often don’t have enough solids to seal the thin and supple sidewalls of Rene Herse tires. Shake the sealant vigorously for 60 seconds (a long time!) to distribute the solids before you put it into the tire. Otherwise, you’ll just inject colored water into the tire!
- If you follow these instructions, and bubbles still appear on the sidewalls, the casing may be too thin (out of tolerance). This happens very rarely, and it’s covered by our warranty. Include a photo of the bubbles when you fill our our warranty form, please.
After a many months of riding, my tires suddenly become porous (tubeless)
- Tires flex as they touch the ground with each rotation. Over time, this loosens the bond between casing threads and rubber coating. Then the sidewalls can become porous and no longer hold air if the tires are mounted tubeless. The continued flexing means that tubeless sealant cannot seal the tires any longer. This can happen before the tire tread is worn out – it depends on the tire pressure (lower puts more stress on the casing), riding style, road surfaces and other factors. The tires are still fine to ride with tubes at this stage.