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Six Six One Filter SPD Shoe - Men's


Item # SSO000A

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  • Gray/Red, 9.0 ($89.95)
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Item # SSO000A

Versatility for every ride.

It's true that being clipped in to your pedals affords you the most efficient power transfer. However, when you're shredding trails, efficiency isn't the only game you're playing. Sure XC races rely on pure speed, but 4X and DH require a unique combination of speed and finesse that trump a traditional carbon-soled mountain bike shoe. The Six Six One Filter Shoe combines the flexibility of a platform shoe with a clip-in style shoe so you'll be ready for anything the mountain throws at you. 

The Filter shoes feature a skate-styled rubber sole with a grip pattern. It's a simple design that allows full functionality for 4X and DH races where all the bells and whistles of a carbon-soled race shoe won't make a difference in your ride.You're able to grip the pedals when needed and easily place a foot down for balance in a tight corner. Speaking of being clipped in, there is an SPD option placed within the nylon shank so that you have the security of a cleat when you need it. 

A durable, synthetic upper, with mesh inserts and perforations helps your feet to breath so that they're not drenched in sweat. Laces and a hook and loop strap secure the Filters to your feet and a partial lace cover and lace keeper ensure that your laces stay tied for the duration of your ride.

The Six Six One Filter Shoes are available in half sizes from 8.0 to 9.5 and whole sizes from 10.0 to 13.0. They come in two colorways: Gray/red and Black/cyan.

  • Durable, synthetic upper with mesh inserts
  • Rubber sole with SPD option
  • 2-hole cleat compatibility

Tech Specs

Upper Material:
hook and loop straps
Cleat Compatibility:
2-hole MTB
Recommended Use:
mountain biking
Manufacturer Warranty:
1 year

Size chart

Six Six One

US Men EU US Women
4 36 6
4.5 37 6.5
5 37.5
5.5 38 7
6 38.5 7.5
6.5 39 8
6.5-7 39.5 8.5
7 40
7.5 40.5 9
8 41 9.5
8-8.5 41.5 10
8.5-9 42 10.5
9 43 11
9.5 43.5
10 44 11.5
10.5 44.5 12
11 45
12 46 13
12.5 47
13 48

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Heavy and bulky - size down

  • Familiarity: I returned this product before using it
  • Fit: Runs large
  • Size Bought: 10

They are very well made and look to last but be warned they are heavy and bulky. I would also size down 1/2 size. I wear a 10, but they fit like a 10.5. The shoe was more bulky than I expected.

Style On the Bike

  • Familiarity: I've used it several times
  • Fit: True to size

These are about the most stylish (i.e. non-bike shoe looking) SPD compatible shoe out there. If you don't want to be mistaken for a racer, these are the shoes to get.
Don't let appearances fool you, though. The stiff soles offer good power transfer and the recessed cleat allows positive pedal engagement without clacking around when off the bike.


Just wondering about the cleat position in this shoes, it looks like it's a little offset to the side, not centered... does it make any awkward feeling in the foot? is it tricky to clipp in?

Best Answer

I think most/all cleats are that way? Anatomically, that position is going to give you the most powerful and efficient pedal stroke.

That alone would not cause any awkward feeling in your feet, but angle and/or forward/back position can put unnecessary stress on your knees, make your toes go numb, etc... Here's a link with some tips for cleat position:


If you've never used clipless pedals before, the first day or two can be a little tricky. SPD pedals have tension adjustments that allow you to make them easier/harder to get in and out of. Once you get the hang of it, you'll be stoked!

Avg. ride time: 2h 43m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

661 Filters

  • Familiarity: I've put it through the wringer

You could say I'��m fond of these shoes. I'm glad 661 brought them back so I could get a third pair. Over the years they really haven't changed them aside from colors, but why change a relatively good thing? These shoes aren't the lightest clip in shoes or the most breathable. While previously ridden by the likes of World Cup DH racers like Steve Peat and Gee Atherton as well as others, I've ridden them from XC races to shuttle laps and everything in between without question. They have a unique style with performance to suit the bill. The sole is stiff enough for putting power down efficiently while not too stiff to cause hot spots on long extended rides. They have good grip for times you might have to get off the saddle and an easy way to tuck laces out of harm's way.

661 Filters

They're Back!

  • Familiarity: I've used it several times

After 2 seasons off, the Filter returns better than ever! Versatility is the key to these shoes. Stiff enough for efficient pedaling on those longer trail rides and stout enough for the bike park. I tend to ride clipped in almost everywhere these days and the Filter is a great go to if you don't need a carbon sole + bike shoe aesthetics. I'll ride into town with these on my single speed and walk around a bit with ease. Also nice that they come in a few half sizes. I ride TIME pedals and they seem to work well with the SPD recessed zone on the Filter sole.