Retrospec Mantra Fixed-Gear / Single-Speed Bike | Matte Olive Drab
Retrospec Mantra Fixed-Gear / Single-Speed Bike | Matte Olive Drab
Retrospec Mantra Fixed-Gear / Single-Speed Bike | Matte Olive Drab
Retrospec Mantra Fixed-Gear / Single-Speed Bike | Matte Olive Drab
Retrospec Mantra Fixed-Gear / Single-Speed Bike | Matte Olive Drab

Mantra Fixed-Gear / Single-Speed Bike

Sale price
$329.99

Traditional Retail Price: $399.99

46 reviews

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Frame Size:
43cm
Rider Height:
4'9"-5'1"
Standover Height:
30.5"
Frame Size:
49cm
Rider Height:
5'2"-5'5"
Standover Height:
31"
Frame Size:
53cm
Rider Height:
5'6"-5'8"
Standover Height:
32.5"
Frame Size:
57cm
Rider Height:
5'9"-5'11"
Standover Height:
33.5"
Frame Size:
61cm
Rider Height:
6'+
Standover Height:
35"

Mantra is our premium fixie/single-speed. Quick response dual braking, sealed bearing hubs, and dripping with style, Mantra is your go-to for your every commuting, cruising, zipping, coasting and speeding need.

Mantra comes standard with sealed cartridge bearing hubs to keep your bike clean and healthy. Less dampness, water, and grime can get into the delicate parts of your bike when the hubs are sealed. This means less required maintenance and a longer living bicycle.

Mantra comes installed on the single-speed side. This is a bike you can ride regularly and quickly and easily transform into a fixed-gear whenever you like.

We have very high standards. Every single element that goes anywhere near our bikes undergoes serious scrutiny. The Kenda commuter tires we pick have a unique tread with water dispersion grooves. There is more surface area on these tires and water travels through the channels on the tire. This means you have more traction and better grip on the road but also minimal resistance. The double-wall super deep-V Star rims with a machined braking surface and the always dependable KMC chain ensure a smooth ride.

We strongly suggest that you take your bike to a professional bicycle mechanic to be built and/or checked out to ensure that the cog and lockring are tightened, the brakes adjusted, and the wheels trued.

Frameset:

  • Hand Built tig-welded high-tensile steel, "UrbanComfort" design, forged horizontal rear dropouts with integrated chain tensioners, bar-spin clearance with no toe overlap
  • Unicrown, Threadless, 28.6mm, fender-eyelet
  • Internal rear brake cable routings
  • 2 sets water bottle braze-ons
  • Rear rack braze-ons
  • Decals protected by clear-coat

Drivetrain:

  • Crank: Mantra Forged Aluminum Alloy 170mm x 46T x1/8"
  • Chain: KMC C1 1/2 x 1/8"
  • BB: Sealed Cartridge
  • Freewheel: 16T x 1/8"

Wheelset:

  • Retrospec aluminum double-wall 32H, 40mm deep-V section, precision machined brake tracks
  • Hubs: Retrospec large-flange aluminum alloy, sealed cartridge bearings, 32H, rear flip-flop, bolt-on
  • Spokes: 14G Stainless steel
  • Retrospec 700 x 28C all-season, P/V valves

Components:

  • Headset: 1 1/8" (28.6mm) steel, Threadless
  • Brakes: Aluminum alloy dual-pivot side-pull calipers & aluminum brake levers
  • Handlebars: Aluminum Alloy 520mm Wide x 30mm Rise, 25.4
  • Grips: Retrospec UrbanComfort Kraton 125mm length
  • Stem: Aluminum alloy 4-bolt Threadless, 80mm extension x 7⁰ rise x 36mm rise, 25.4 handlebar clamp, 28.6 steerer
  • Saddle: Retrospec Urban2
  • Seatpost: Aluminum Alloy Seat Post 25.4 x 300mm with Micro Adjust head
  • Seatpost Clamp: Aluminum alloy CNC precision 28.6mm
  • Pedals: Low-Profile Platform, Reinforced Nylon resin, 9/16"
Recommended Weight Limit: 250 LBS

Measuring Inseam

Inseam is the most important metric to consider when deciding on bike size. In order to take this measurement properly, follow these guidelines:

  1. Stand upright with your feet 6-8" apart.
  2. Using a tape measure or tailor tape, measure from the bottom of your foot to the top of the inside of your leg.
  3. Compare your inseam measurement to the standover height of the bike. You should have about an inch of space between your body and the top tube.

Additional Sizing Info

Mantra comes standard with sealed cartridge bearing hubs to keep your bike clean and healthy. Less dampness, water, and grime can get into the delicate parts of your bike when the hubs are sealed. This means less required maintenance and a longer living bicycle.

Mantra comes installed on the single-speed side. This is a bike you can ride regularly and quickly and easily transform into a fixed-gear whenever you like.

We have very high standards. Every single element that goes anywhere near our bikes undergoes serious scrutiny. The Kenda commuter tires we pick have a unique tread with water dispersion grooves. There is more surface area on these tires and water travels through the channels on the tire. This means you have more traction and better grip on the road but also minimal resistance. The double-wall super deep-V Star rims with a machined braking surface and the always dependable KMC chain ensure a smooth ride.

We strongly suggest that you take your bike to a professional bicycle mechanic to be built and/or checked out to ensure that the cog and lockring are tightened, the brakes adjusted, and the wheels trued.

Frameset:

  • Hand Built tig-welded high-tensile steel, "UrbanComfort" design, forged horizontal rear dropouts with integrated chain tensioners, bar-spin clearance with no toe overlap
  • Unicrown, Threadless, 28.6mm, fender-eyelet
  • Internal rear brake cable routings
  • 2 sets water bottle braze-ons
  • Rear rack braze-ons
  • Decals protected by clear-coat

Drivetrain:

  • Crank: Mantra Forged Aluminum Alloy 170mm x 46T x1/8"
  • Chain: KMC C1 1/2 x 1/8"
  • BB: Sealed Cartridge
  • Freewheel: 16T x 1/8"

Wheelset:

  • Retrospec aluminum double-wall 32H, 40mm deep-V section, precision machined brake tracks
  • Hubs: Retrospec large-flange aluminum alloy, sealed cartridge bearings, 32H, rear flip-flop, bolt-on
  • Spokes: 14G Stainless steel
  • Retrospec 700 x 28C all-season, P/V valves

Components:

  • Headset: 1 1/8" (28.6mm) steel, Threadless
  • Brakes: Aluminum alloy dual-pivot side-pull calipers & aluminum brake levers
  • Handlebars: Aluminum Alloy 520mm Wide x 30mm Rise, 25.4
  • Grips: Retrospec UrbanComfort Kraton 125mm length
  • Stem: Aluminum alloy 4-bolt Threadless, 80mm extension x 7⁰ rise x 36mm rise, 25.4 handlebar clamp, 28.6 steerer
  • Saddle: Retrospec Urban2
  • Seatpost: Aluminum Alloy Seat Post 25.4 x 300mm with Micro Adjust head
  • Seatpost Clamp: Aluminum alloy CNC precision 28.6mm
  • Pedals: Low-Profile Platform, Reinforced Nylon resin, 9/16"
Recommended Weight Limit: 250 LBS

Measuring Inseam

Inseam is the most important metric to consider when deciding on bike size. In order to take this measurement properly, follow these guidelines:

  1. Stand upright with your feet 6-8" apart.
  2. Using a tape measure or tailor tape, measure from the bottom of your foot to the top of the inside of your leg.
  3. Compare your inseam measurement to the standover height of the bike. You should have about an inch of space between your body and the top tube.

Retrospec IRL

Customer Reviews

Customer Reviews
4.7 Based on 46 Reviews
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Filter Reviews:
BD
06/16/2020
Bernard D.
United States United States
Great Starter Fixie/Single

First, I have to say that I absolutely love my Mantra. I got it for a smoking good deal. In my opinion, it's worth every single penny. That's not to say that this is a top-of-the-line bicycle by any means. There are obvious areas in which costs were cut, like the brake levers, which have way too much play and feel like they're made of brittle metal. The seat post and pedals are generic as generic comes. But other areas where a few splurges helped raise the level of the machine. I appreciate the forged crankset. I appreciate the sealed hubs. I appreciate the durable and rideable Kenda tires, which have taken a lot of miles with good feel and wear. Could it use a chromoly frame instead of a hi-ten steel one? Can't replace the "feel of steel," right? Well, to get that 6160 goodness, carbon forks, nice brake set? You have to step up to the Drome for that. But, who needs brakes on a fixie anyways? Am I right? It's a super fun bike, as a commuter and city ride. It could probably be used for some light training, but I wouldn't consider it a proper road bike or of that sort. I would definitely recommend this as a great starter fixie, of the same ilk as others in this price range and construction. It's a reasonable first step before you consider stepping up to some a bit costlier.

NS
06/16/2020
Nick S.
United States United States
Smooth Durable Ride!

This is the first product I have purchased from Retrospec, and I love it! I live in a suburban area and have no issues with taking it on the roads, climbing hills, and even going over some light gravel paths. I have managed to get it up to some really quick speeds on flat portions as well, which is always a great time. All in all, a very solid bike that I would recommend to anyone.

DW
05/27/2020
Dominiqic W.
United States United States
Looks Amazing

This was my first purchase from Retrospec and I am beyond pleased. The bike arrived in great condition and was fairly easy to assemble. A video of assembly would work better than the instructions.

MT
05/24/2020
Mallory T.
United States United States
First Bike!

This is the first bike I have bought in my adulthood. I was nervous because I didn't know if it was going to be the right size but I am 5'7 and the medium was perfect, just had to lower the seat down. I built it on my own but the front brakes were a little janky. After taking it into a shop to get tuned up I could not stop riding this bike! I love it!! Such a smooth ride that helps me get in and out of the city. I take it to work and school almost everyday.

TH
05/20/2020
Tyler H.
United States United States
Great bike

So far, so good with the Mantra. Bike came packaged very well and putting it together was pretty straight forward. I’ve had a blast riding around on it so far.

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