Category Archive

Below you'll find a list of all posts that have been categorized as “Equipment”

Measuring saddle positions

Rob Equipment, News

The standard method is to measure height from the ground and off-set of the saddle nose from the centre line of the bottom bracket. This works well on a single bike but is not ideal when trying to replicate the back-end geometry between different bikes. Here’s an alternative method that I use …..

Options for the front end

Rob Aero Tips, Equipment

If you go to an event and observe the riders on time trial machines you will see a wide range of front end positions. Getting the most efficient position for both aero performance and power production is the Holy Grail. In this post I attempt to give some structure to the process of finding that position ….

Test session at Newport Velodrome 28th February 2018

Rob Aero Tips, Equipment, Venue

I book a three hour slot at Newport Velodrome once or twice a year, and use the data to validate my “open field” test results and to refine options. In this session I was benchmarking a 54 P3 with a new configuration of bars and wheels. In parallel I tested some shoe and helmet combinations.

Michelin latex tube

Wheel and tyre comparisons

Rob Equipment

Some pretty basic wheel and tyre comparisons – I’m limited by the availability of wheels and testing equipment, but …..

KCNC Jockey Wheels

Drive Train Options

Rob Equipment

I guess we’ve all heard of drive train losses and drive train efficiency. There was a blog post on “keeping it clean” 13th October 2016. I’ve talked to a few people since then, and picked up some interesting tips.

Composite picture

GPS speed or dedicated speed sensor?

Rob Equipment

What we need when aero testing is reliable speed and power data. A speed sensor working properly will be more repeatable than speed derived from GPS data. The speed and distance recorded will also be more accurate if the wheel circumference is set-up correctly.

Clean sprockets and chain

The importance of a clean drive train

Rob Equipment

Grimy drive trains are sticky and they absorb power. Why waste power when you’ve invested in aero gains? So before every important event I remove the chain, the mech., and the cassette, and clean them all thoroughly. I clean the chain ring on the bike. I lubricate the mech on the work bench and then re-fit it …… ….. then …

Front end of P3 161006

Progression from CdA 0.2400 to CdA 0.1750

Rob Equipment

When I came back to time trialing in 2011 I was using an old low-end Pinarello road frame with a SRAM S60 front wheel and a FFWD disk. I’ve gain about 40 watts of FTP since then, but I’ve also gained about 65 virtual watts by reducing my CdA. I achieved my goals of under the hour for a 25TT …