SIMWORKS × NITTO
A bicycle changes,
from the point where you hold it.
SimWorks dreams it up, and NITTO makes sure it works.
SimWorks by NITTO is a series of handlebars, stems, racks, and seatposts created by Circles' original brand SimWorks and Japanese parts manufacturer NITTO. SimWorks dreams up a form that is "fun to use," and NITTO turns it into a "safe and reliable" product. For over 15 years, the two have continued to make things together, each playing their part.
MADE BY NITTOMade in Japan by NITTO
BAR・STEM・RACK・POSTFrom your hands to your cargo
CrMo & ALLOYChromoly and aluminum
15+ YEARS TOGETHEROver 15 years together
01 / WHY NITTO
Fun forms,
reliable tools.
No matter how diverse styles become, products should always be safe for everyone. That is at the heart of NITTO's approach to making things, SimWorks believes.
FUN × SAFE
Clear roles.
SimWorks' job is to design things that are fun to use. NITTO's job is to turn them into safe and reliable products. The forms that came to light while playing in the mud have been turned into products using NITTO's technology.
NO WEIGHT LIMIT
Safe for everyone.
NITTO's seatpost manuals don't list a weight limit for any model except the race model. Whether you're a child or a sumo wrestler. At the factory, they continue to test them with enough force to make bending visible to the naked eye.
TESTED EVERY DAY
Tested all day long.
Racks loaded with weights are subjected to continuous vibration as long as the factory is running. Handlebars are pulled at both ends, with the method changing from day to day. This accumulation of unglamorous testing builds trust.
02 / BY PART
Where do you want to
start?
Handlebars, stems, racks, seatposts, small parts. Choose the area you want to replace, and the list below will be filtered to show only that type.
HandlebarsHANDLEBARSimWorks dreams up a form that is fun to use, and NITTO turns it into a safe and reliable product. These handlebars were born from the uncompromising demands of both companies.
View handlebars →
StemsSTEMLightness is an eternal theme. But it is not the most important thing. The appeal of a steel stem is the agility that a single welder can create for a single person.
View stems →
RacksRACKConvenient for everyday use and travel, yet beautiful even when empty. Made from chromoly tubing, with the black finish also plated with a base layer.
View racks →
SeatpostsSEAT POSTThe body's starting point is the hips. Please experience the quality of NITTO seatposts that have continued to support keirin racers.
View seatposts →
Small partsSMALL PARTSThey are small, but if we are talking about greatness, they are top-tier. From Sim Drops for the ends of the handlebars to bolts. ... Just kidding.
View small parts →03 / THE CLASSICS
If you are unsure,
start with these eight.
These are the classics of SimWorks by NITTO that are often chosen at Circles. Sizes and colors can be selected on each product page.
FLAT BAR
Getaround CrMo Bar
A historic bestseller from SimWorks that can be used both on and off the road. 700mm wide, 20° backsweep.
Learn more →
Flat barFLAT BARFLAT BAR
Little Nick CrMo Bar
A thick, long, smooth bar with a 15° bend that fits comfortably in the hand. It can be cut anywhere and attached to any bicycle.
Learn more →
RISER BAR
Mowmow CrMo Bar
Strong, as light as possible, and chic. NITTO has redefined the standard riser bar.
Learn more →
STEM / 31.8
Rhonda Stem
A timeless classic that makes the bicycle shine without being too flashy. 4-bolt, with lengths from 50 to 120mm.
Learn more →
STEM / 25.4
Tomboy Stem
A chromoly stem with a 25.4mm clamp. 4-bolt, with lengths from 50 to 120mm.
Learn more →
SEAT POST
Beatnik Post
Engraved with a heart and the SimWorks logo. A seatpost made only by NITTO's carefully selected master craftsmen.
Learn more →
BAR END
Sim Drops
A shine that is unmistakable, all the way to the ends of the handlebars. Aluminum bar ends available in six colors.
Learn more →
SPACER
With Me CrMo Spacer
Chromoly spacers that match SimWorks' chromoly stems. Available in four lengths and three colors.
Learn more →EVERY 10TH / NITTO DAY
The 10th of every month is NITTO Day.
On the 10th of every month, anyone who purchases a NITTO product in-store or from the WebShop will receive a NITTO patch. SimWorks by NITTO products are also eligible.
The 10th of every month is NITTO Day.
04 / INSIDE NITTO
What we saw
at the factory.
The Circles staff visited NITTO's factory in Fukushima. How are beautiful, durable, and safe products made?
Factory Visit Report: The Secret of Strength Factory Visit Report: How Handlebars Are Made
05 / SIMWORKS FAMILY
Another face of
SimWorks.
Original products made by the team themselves, and series created in collaboration with makers in Japan and the United States. All are made with the same "user-focused" perspective.
06 / STORIES
For those who want to read a little more.
Just right.
The story of a perfectly balanced bike built with SimWorks by NITTO parts.
Read the article →
Mowmow Cowcow
Mowmow and Cowcow. Two riser bars.
Read the article →
Little Nick Bar SSB
The story of the Little Nick Bar, which we also recommend for those changing handlebars for the first time.
Read the article →
Wonderer Bar is Back!
The Wonderer drop bar is back.
Read the article →
To Smile Bar is back!!
The To Smile Bar is back in stock, making you smile when you hold it.
Read the article →
Can a good feeling be quantified?
The most popular flat bar, Getaround CrMo, is back.
Read the article →There are also introductions by the makers at SimWorks.Read SimWorks by NITTO on the SimWorks official website →
SIMWORKS BY NITTO PRODUCTS
Everything starts here.
You can filter by type from "Where to start?" above. Clamp diameter, length, and color can be selected on the product page.
B-stock, damaged packaging, and long-term inventory items are gathered in the outlet Diggin' the Circle.
We’ll help you choose the right combination of handlebars and stem.
Please tell us about your current bike, including the clamp diameter of the handlebars and stem, and what kind of riding position you prefer. We’ll help you choose the best combination.