UNO ASA-105 Stem (31.8)

uno steel
UNO ASA-105 100mm

This 100mm stem weighs only 107g, saving up to 53g over an OEM stem. They are made by Kalloy, a major OEM supplier of components like stems, seatposts and bars. Fit and finish are good, they meet CEN standards. UNO is their own house brand, but you can also find these rebranded for much more money. Comes in a wide variety of lengths 80-130mm, in both 7° and 17° versions. While not the best value if replacing purely for weight reduction, if you need to change stems for fitting purposes, you will most likely end up paying more for a heavier stem buying anything else. They come with different logos depending on year. There is another version of the stem that looks almost identical, but is slightly heavier and made from 6061, the ASA-025. At $21, and saving 2.5g per dollar, it represents a good value, moderate cost upgrade. They can be found on eBay. If you can’t wait for overseas shipping you can pay a premium for a similar OS stem made by Kalloy from Nashbar or Performance Bike.

stem
Stock Stem

 

Overview:

Price: $21 [Moderate Cost]

Value: 2.5g/$ ($0.40/g) [Good Value]

✔ Recommended

 

Hylix Stem (31.8)

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Hylix 100mm w/ Ti bolts

This 100mm stem weighs only 99g, saving up to 61g over an OEM stem. These are junk. Fit and finish issues all over, poorly machined, the steerer clamp seems to be overbored, and the bottom of the clamp isn’t flat, applying unequal force on the headset. There’s no particular reason to buy this stem, especially not at full price. Kalloy UNO stems are better quality, and a well established brand. The only reason to buy this stem is because sometimes you can win an auction for one with Ti bolts for the price of Ti bolts.

stem
Stock Stem

 

Overview:

Price: $27 [High Cost]

✘ Not Recommended

Poorly made, get an UNO ASA-105, 7050, or “7” stem instead.

 

Wellgo MG-8 SPD

mg8
Wellgo MG-8

These pedals weigh only 242g for a pair, saving up to 122 grams over Shimano PD-M520. The pedals are significantly lighter than the entry level Shimano PD-M520 which are often used as first clipless pedals, or any Shimano SPD pedals for that matter. However, they are single sided, require some practice and are not as easy to use as double sided SPD pedals. They also use an inboard bushing like many cheaper or lighter pedals, and will eventually wear out, but being made by Wellgo, are otherwise completely functional pedals. The sources for these pedals at low cost are drying up. You can get an ugly painted version from Pricepoint for $30, but they are otherwise $45 on eBay. Aawyeah seems to have recently sold out. At $30 saving 4.1g per dollar, it represents an excellent value, high cost upgrade. It can be purchased on Pricepoint and eBay, and formerly Aawyeah.

m520
Shimano PD-M520

 

Overview:

Price: $30 [High Cost]

Value: 4.1g/$ ($0.25/g) [Excellent Value]

✔ Recommended with caveats

Some may find single sided pedals awkward, and the bushing will eventually wear out, especially if you don’t maintain them. Supplies seem to be limited. At $45, they’re only a good value.

 

Zeray SPD

zeray
Zeray SPD Pedals

These pedals weigh only 274g, saving up to 99g over entry level Shimano PD-M520. These are junk. Advertised as 250g and having ball bearings, it seemed like a promising replacement for single-sided Wellgo MG-8. I don’t know if there’s multiple versions, but the ones I received had an extremely crude bushing system, not ball bearings. One pedal was tightened so it couldn’t spin at all. When loosened, it would bind up during one part of the rotation, and have play on another part of the rotation. Maybe it would wear in and smooth out. I didn’t bother to find out.

m520
Shimano PD-M520

 

Overview:

Price: $30 [High Cost]

✘ Not Recommended

Junk pedals. Very low quality internals that use poorly made bushings.

 

J&L 36g Skewers

JL skewers
J&L 36g Skewers

These titanium skewers weigh only 36g, saving up to 82g over generic steel skewers. Build quality is unimpressive. On one set, the recess for the springs was not large enough for the springs, and the threads were different pitches. The other set had plastic washers. On both, the machining accuracy of the levers was poor and not well aligned. These have additional weight reduction over the generic titanium skewers because they are turned down to be narrower in the middle, and have a light weight titanium lever. The alloy faces have very little bite, but skewers are not through-axles, and mostly intended to apply compression force on the dropouts. If working as intended, it is the friction between the serrated steel nut on the hub and the dropouts that holds the wheel in place, not the friction of the skewer. However, these may not be strong enough for horizontal dropouts. I dislike the round profile springs that come with these and usually use the flat spring that come with the original skewers. At $36, they cost $26 more than the generic titanium skewers for an addition weight savings of only 14g making this a relatively poor value, high cost upgrade. It can be found on eBay.

generic skewers

Generic Steel Skewers

 

Overview:

Price: $36 [High Cost]

Value: 2.7g/$ ($0.44/g) [Good Value]

✘ Not Recommended

While they do work, the generic titanium skewers are simply a better value and better quality. Only consider these if you need to lose every last gram. If you carry a multi-tool, and don’t have a team mechanic to hand you a new wheel, consider using titanium hex skewers which are of similar weight.