For those riders who absolutely must have the lightest bike possible, Aerozine have part of the solution. Finely machined and ultra-light, these rear derailleur pulleys add a splash of colour and trim a few grams of weight from your ride.

Simple to install, the Aerozine pulleys replace your standard jockey wheels, making spring time an ideal time to get a set after the winter road paste has done its damage.

Although the Aerozine pulleys have cartridge bearings rather than the bushings you find in most jockey wheels, I can't say I felt myself going any faster, but they add no perceptible lag to performance either. If you're looking for an excuse to upgrade, then, performance isn't it, but looks and weight are good enough reason.

At first glance, the Aerozine pulleys are a luxury but if you need to replace your jockey wheels anyway, then they are perhaps a good choice - just make sure they match your frame colour.

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Tell us what the product is for, and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

Performing a dual role of both weight-loss and winter replacements they do a solid job, can't really fault them.

if you need to replace worn jockey wheels they are fine, if you are looking to save weight they do a job at a price.

A fun addition to the bike. Hard to justify a purchase on weight grounds unless it is super important to you, but as a stock replacement they seem a good option.

I regularly do the following types of riding: time trialling, commuting, touring, sportives, general fitness riding, Adventure-packing, crossing-countries

got a pair of these on my bike and really like them they look good and last longer than the standard plastic ones that come on your bike. the 11T makes it only compatible with sram and shimano but if you have got campagnolo you need a 10T jockey wheel.

I got a set of the cheapest ones with ceramic bearings on ebay (about £15) and fitted one in the guide pulley (upper) position on my commuter (Ultegra 6600).

The difference it makes to shifting is remarkable. The Ultegra guide pulley is cushioned, giving smooth shifts. These and their like are rigid, so you get much snappier Campag-like shifting. Recommended, if only for that!

These remind me of the blue anodised X-Lite crank caps I put on my old Marin MTB in about 1996. Love a bit of bling!

Likewise. Blue X-lite crank caps, on a Middleburn RS3 chainset with blue spider and middle ring. With blue chainring bolts. And blue jockey wheels and breakaway bolt, obviously.

I have the gold ano ones as this was the only color available here (India) and have used them on Shimano XT though only for races (weight weenie trait).

There is no upper (floating) 'Centron G Pulley' a la Shimano, so the rd adjustments need to be spot on. I found them a bit more noisy than the standard nylon/ plastic pulleys. Tested the pulleys on some training rides that were bumpy as I thought they might crumple. They've held up just fine.

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Nine great upgrades for under £100 — go faster, climb easier, get more comfortable, and shift and stop better

Every product is thoroughly tested for as long as it takes to get a real insight into whether it works or not. Our reviewers are experienced cyclists that we trust to be objective, and we strive to ensure that all opinions expressed are backed up by facts, but reviews are always a reviewer's informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores. It reflects both a product's function and value. Good scores are more common than bad, because fortunately good products are more common than bad. Here's what they mean:

Yes, but since some drivers give cars that much room when overtaking, that rule is nonsense.  It needs to be rewritten to say that they should be...

Are you going to watch a race or competing ? Cycling 85k would be doable with training. Racing 85k is a different matter altogether.

"The bus driver was given driver education at the roadside from a specialist roads policing officer to prevent any recurrence of such an incident"....

For his family and friends, they can at least take consolation that he died doing something he clearly loved....

It's a no-brainer for me (Green Commute) but I'm a higher rate tax payer. Seriously considering getting my employer to join so I can get an e-cargo...

More likely than limit screws (if it's not tension) is that the derailleur has taken a knock, particularly if it's a band-on one. 

Alcohol Cotton Swab

Yates needs to eat his words, I really cannot stand the disrectful comments he made about how the riders should fear him, this isn't boxing, what...

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