90 degree tire valve direction?

The ST uses 11.3mm stems. (Dave thanks for the additional info.)

Correction noted.
 
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Kevcules said:
Dave......where did you get your Ariete valve stems from and what size are they?

Thanks
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Kevin, I've bought at least a half dozen pairs for bikes and gotten them from a variety of places. Some came from Kurveygirl.com, some I ordered through my Honda dealer, and some recently off Amazon for $16.00 a set. Honda wheels take the 11.3 mm size.
 
CYYJ said:
Rob:

A "head's up" for you - if you ever want to fit Tire Pressure Monitoring Sensors (TPMS) on your moto, you will need to go back to normal "straight" valve stems, made out of metal, not plastic, if you use the type of sensor that fits over the top of the valve stem - such as the Garmin sensors.

Fitting sensors on angled valve stems can cause several problems, one of which is an out-of-balance condition, and more seriously, the stress put on the base of the stem by centrifugal force when riding at high speeds can cause a failure (fracture) of the stem where the stem attaches to the wheel.

Michael
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I disagree. I've used TPMS sensors on aluminum 83 degree stems for several years on several bikes without issue. The sensors weigh just .3 oz and technically could cause an out-of-balance wheel but I've not been able to notice this to unmentionable speeds. I guess you could balance the wheel with the sensor in place to eliminate any possibility of this. Metal stems are at risk of cracking from centrifugal force but the stems are very sturdy and the sensors are so light I think the force is minutely increased. I'll take the risk as offset from the chance of running a tire with a slow leak for hundreds of miles on a long ride and overheating/delaminating it. I think that many tire failures are really caused by running tires under inflated and over loaded, particularly Goldwings. Two up couples routinely run a hundred pounds or more over the +/- 400 lb payload rating and the rear tire pressure is not easy to check.
 
Rob20111 said:
On both of my bikes, ST1100 and GL1500, i have 90 degree valve stems front and rear.
On both bikes the rear valve faces right and front faces left. Just curious if there was a reason for this offset.
I would think that both facing right would be a better choice especially from a safety point of view (side of the road).
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Rob20111 said:
On both of my bikes, ST1100 and GL1500, i have 90 degree valve stems front and rear.
On both bikes the rear valve faces right and front faces left. Just curious if there was a reason for this offset.
I would think that both facing right would be a better choice especially from a safety point of view (side of the road).
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Your thinking is correct. Personally, I have an 83-degree stainless valve stem from Curvey Girl on the rear and a "shorty" valve stem on the front wheel. Works great for me.
 
Thank you gentlemen, ordered a black set from the online forum vendor.....
 
I am sorry to be somewhat contrary but all of this discussion regarding out of balance issues and valve stem issues completely misses the mark.

Which valve stems are the fastest when mounted in which orientation?

G
 
GGely said:
I am sorry to be somewhat contrary but all of this discussion regarding out of balance issues and valve stem issues completely misses the mark.

Which valve stems are the fastest when mounted in which orientation?

G
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I'll let you know this summer with the black ones mounted to the right! :)
 
GGely said:
Which valve stems are the fastest when mounted in which orientation?

G
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Really depends how fast the bike is flying through the air, which is dependent on its terminal velocity and the height of the cliff it has just left.
 
The disadvantage of mounting a stem facing either left or right is that it disturbs the boundary layer and causes additional drag. For maximum speed the right angle stems really should be parallel to the rim pointing forward. Besides adding at least .2 in the quarter it reduces the change of rotational forces acting on the valve core and air escaping. But only if you use metal valve stem caps with teflon. Friction of the air stream can cause plastic caps to expand and not seal properly.
 
Related question: Are all pressure sensors in the stem cap? I had read once (I think!) there was a sensor located on the base of the stem inside the rim (??).
 
Duporth said:
Related question: Are all pressure sensors in the stem cap? I had read once (I think!) there was a sensor located on the base of the stem inside the rim (??).
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Most (all?) factory TPMS systems have sensors inside the rim (internal). Most , but not all aftermarket systems have sensors on the end of the valve (external). Pros and cons to each of the systems
 
Duporth said:
Related question: Are all pressure sensors in the stem cap? I had read once (I think!) there was a sensor located on the base of the stem inside the rim (??).
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Orange TPMS are internal, base of stem. Been using one for about 5 years now. Love it!
 
Thanks. Would the internal sensor be preferred? It seems a neater solution, less losable (!) and 'permanent'. It may be down to price I guess.
 
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