Review – Wolf Tooth 16 Tooth Cog


So earlier this year I installed a 42 tooth cassette cog to create an extended range setup on my 10 speed Sram cassette. It was a great upgrade to the drivetrain but I did notice very quickly that shift wasn’t as smooth across the smaller cogs. The jump from 15t to 19t was good but fair from smooth and under any kind of load was terrible. I started off with the SRAM 1070 11-32 cassette. By adding the 42 tooth cog I removed the 17 to make space.  This gave me 11, 12, 13, 15, 19, 22, 25, 28, 32, 42. The 4 tooth jump between 15 and 19 was to much.


For the fair price of $14.95 plus shipping I bought the Wolf Tooth Components 16 tooth Cassette cog. Installing was super easy. After removing the rear wheel and cassette, I replaced the 15 tooth cog with the 16 tooth. Giving me 11, 12, 13, 16, 19, 22, 25, 28, 32, 42 for cogs. After reinstalling everything, first ride and putting typical shifting load through the cogs was smooth again.


In the end I suppose I shouldn’t be so surprised but the difference one cog up or down can make and the cost to sort this out is spot on. Based on the cost and the short amount of time it took to replace the cog, this is the kind of job any home bike mechanic should be doing and have on their personal to do list.

Pros –

  • Perfect fit on SRAM cassette
  • Resolved shifting issue.

Cons –

  • Loss of ….. sorry can’t think of one.

Cost – $14.95

Information from Wolf Tooth Component Site below.


Shimano 10 speed cassettes

  • XT 11-36t (CS-M771)
  • XTR 11-36t (CS-M980)
  • Other 11-36t shimano cassettes like SLX HG81 11-36t – Modification required (must drill out rivets holding the 17t to the larger cogs)

SRAM 10 speed cassettes

  • PG 1030, 1050, and 1070 – 11-36 and 12-36
  • X0 11-36t(XG – 1080) – Remove the 14t rather than the 17t

Tech Specs:

  • See detailed instructions on our tech page: 16T instructions
  • The cog is 1.6mm thick and weighs 17g

Reviewed – Topeak D2 Pressure Gauge

This was one of those tools I wanted for a long time but just never seemed to be able justify the cost verse reward. After all how bad could my floor pump be anyway?

My final reason to buy one was switching to tubeless. The form and function of the D2 are very simple. The slide on the end switches between Presta and Schader valves. On the display section of the gauge you will find the universally known power button. Another to change between PSI and BAR. The final digital button is a adjustment mode. After turn the device on and pressing the adjustment button the read out will blink. When mounted to the air valve it will read the current pressure in your wheel. The big yellow button on the front of the gauge when pressed will let air out so you can fine tune the air in your wheels. The rotating head makes for easy access and comfortable use on different bikes and wheel sizes.

It has quickly turned into one of the most used tools I have and find it valuable to even take on rides. I am still learning the pressure game with my wheels and find it interesting after riding a section of trail and it either felt great or not to check my tires for clues. I don’t always make changes but have found pressure surprises more then once.

I have had the Topeak D2 for just over a year. What ever the original battery is its still in it and working great. The tool nerd in me would love to have access to some testing equipment to verify its accuracy. After an original glance at the directions when I opened the packed, this device is super easy to use and I’m very confident in it’s results.

I bought this on Amazon for $27.96 and it is now listed for $33.56. For me this is a great tool and investment and has helped me with setting up tubeless with confidence. The only thing I wish this device had was a backlit digital display. For a small tool to inspire me and my bike setup I would rate this tool with a thumbs up.

Thumbs-up-clipart-2  IMG_0383


Here is the specification from Topeak.

Topeak D2 Smart Head Digital Pressure Gauge

The second-generation digital gauge features a rotating SmartHead™ and works seamlessly with Presta and Schrader valves without changing parts. Precision digital gauge reads up to 250 psi/17 bar and is designed for use with tires, suspension forks and rear shock units.

LCD display can be programmed to show pressure in psi, Bar, or kg/cm2.


  • Head SmartHead™
  • Gauge Digital – PSI, Bar, kg/cm2
  • Battery CR2032 x 1 (included)
  • Body Engineering Grade Plastic
  • Capacity Reads 250 psi/17 bar
  • Rotating Head
  • Air Release Button
  • SmartHead™ rotates 180 degrees
  • Large display reads in PSI, Bar and Kg/cm2
  • SmartHead™ auto-adjusts to fit Presta and Schrader valves
  • Air tune button to fine tune pressure
  • Uses 1 CR2032 battery
  • Size (L x W x H): 10.2 x 4.5 x 3.5cm 4” x 1.8” x 1.4”
  • Weight: 65g/2.29oz