Support
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FAQ
Purchase
Safety and Security
Specs and Customize
Accessories
Development Plans and Others
Purchase
Where can I purchase iruka and the accessories?
Please refer Shop list page.
I can’t find a dealer in my neighborhood. How can I purchase iruka and the accessories?
Please send us an email (info@iruka.tokyo) or ask a bike shop near your home to contact us.
Are you selling iruka online?
No, we, iruka Inc., aren’t. However, some shops are. Please ask each shops for the details.
Safety and Security
Due to the structure of iruka, what should I pay special attention for safely?
The following 2 points are the most important and unique that other bicycles do not have. For more details, please refer iruka owners Manual.
- Do not carry the bicycle by the rear wheel when the bicycle is folded. Doing so may lead to injury due to the rear wheel turning and trapping your fingers between the frame and the rear wheel. (iruka is sold with a wheel cover to prevent fingers going through the rear wheel)
- Check that the stem and the handle post is inserted to the very bottom and that the cam levers are closed steadily.
Has the frame strength passed official safety tests?
iruka’s frame strength passed the listed official safety tests conducted by Taiwan Cycling and Health Tech Industry R&D Center.
- Frame fatigue test with a vertical force (EN4.8.6)
- Impact test (Falling mass) (EN4.8.2)
- Impact test (Falling frame) (EN4.8.3)
What about the product warranty?
One year from date of purchase. Please have the retailer sign the warranty document included in the product package. Bring the document with you when you visit the retailer to receive services specified in the warranty.
Specs and Customize
What are the gear ratios of Shimano Alfine 8S?
Please see below.
- 1st 0.527
- 2nd 0.644
- 3rd 0.748
- 4th 0.851
- 5th 1.000
- 6th 1.223
- 7th 1.419
- 8th 1.615
What are the gear ratios of Shimano STePS Nexus Inter 5?
Please see below.
- 1st 1.000
- 2nd 1.277
- 3rd 1.622
- 4th 2.070
- 5th 2.630
Where can I find the main geometries such as wheel base?
Please go to Overview | Specs page.
What is the cylinder-shaped part at the joint of the main frame and rear swing arm?
Elastomer suspension. It absorbs vibrations the bicycle picks up while on the road.
Can I mount different sized tires from the original (18 in x 1.25 and 1.50)?
Tires that exceed 460mm in diameter or 40mm in width may interfere with the main frame when folding. Please check the compatibility in advance when using any tire that exceeds 18 in x 1.50.
Can I change the seat post?
Yes, if the post is 27.2 mm in diameter. However, if the length exceeds 380mm, the seat tip may touch the ground when folding.
Can I customize the drivetrain parts?
iruka may be customized if each part matches the size of the original parts. However, as all parts of iruka are designed to fold with precision, we don’t recommend customizing the drivetrain system or control system. If you do consider customizing your iruka, please seek advice from your retail shop’s staff. Below are some possible issues that may arise during customization.
Crank set
A chain ring with a diameter over 250mm or with a cover on the back may interfere with the rear swing arm when folding. Also, when the crank set is changed and the Q factor (the distance between the outside of one crank arm to the outside of the other crank arm) is decreased, the tip of the crank may interfere with the caster when riding, or with the rear end when folding. In general, a front derailleur cannot be installed because there is not enough space.
Rear hub, gear box
If you decide to replace the original internal gear with an external sprocket hub, extra steps must be taken – such as removing the inner sprocket – to avoid the chain interfering with the rear fork when using inner gear. You may attach a derailleur on the rear drop end, however, a standard derailleur may cause the chain to slack or fall off when folding.
Bottom bracket
The original bottom bracket is specially designed to use a long axle. If it is changed to a shorter bottom bracket and the Q-factor (the distance between the outside of one crank arm to the outside of the other crank arm) is decreased, the tip of the crank may interfere with the caster when riding, and with the rear end when folding.
Handle bar
A handle with different size and shape might interfere with the main body and/or with the ground surface when folding. Also, when the brake lever and shifter are repositioned significantly different from the original design, it may entangle the wires during folding and unfolding, thereby affecting the bike’s braking ability.
Brake
A V brake or caliper brake cannot be installed because there is no base for a caliper. A rear disk brake rotor with larger diameter will interfere with the rear end.
Crank set
A chain ring with a diameter over 250mm or with a cover on the back may interfere with the rear swing arm when folding. Also, when the crank set is changed and the Q factor (the distance between the outside of one crank arm to the outside of the other crank arm) is decreased, the tip of the crank may interfere with the caster when riding, or with the rear end when folding. In general, a front derailleur cannot be installed because there is not enough space.
Rear hub, gear box
If you decide to replace the original internal gear with an external sprocket hub, extra steps must be taken – such as removing the inner sprocket – to avoid the chain interfering with the rear fork when using inner gear. You may attach a derailleur on the rear drop end, however, a standard derailleur may cause the chain to slack or fall off when folding.
Bottom bracket
The original bottom bracket is specially designed to use a long axle. If it is changed to a shorter bottom bracket and the Q-factor (the distance between the outside of one crank arm to the outside of the other crank arm) is decreased, the tip of the crank may interfere with the caster when riding, and with the rear end when folding.
Handle bar
A handle with different size and shape might interfere with the main body and/or with the ground surface when folding. Also, when the brake lever and shifter are repositioned significantly different from the original design, it may entangle the wires during folding and unfolding, thereby affecting the bike’s braking ability.
Brake
A V brake or caliper brake cannot be installed because there is no base for a caliper. A rear disk brake rotor with larger diameter will interfere with the rear end.
Accessories
What are the requirements for a coupler on other bicycles?
It is compatible with a saddle with a rail width of 44mm (center distance, allowance ±1mm). It requires an M5 hex wrench for installment.
What are the requirements for using iruCart on other bicycles?
If the coupler (not included in the product package) can be attached to the saddle, iruCart can be used on bicycles with an approximate wheel radius of 600mm (varies by the saddle height and rear center length).
What are the requirements for using iruCarry on other bicycles?
If the coupler (not included in the product package) can be attached to the saddle, iruCarry can be used on bicycles with a seat post radius of 26-35mm. Please note that when there is not enough space on the seat post, it could cause the back shelf to interfere with the rear, and/or eliminate luggage space.
What are the requirements for using iruCatch on other bicycles?
iruCatch can be attached to a handle post with a diameter of 22-35mm.
Does iruka come with a mudguard?
It is not in the standard option, however, there are holes for the M5 bolt on the backside of front fork crown.
Does iruka come with a kickstand?
It is not in the standard option, however, you can install a kickstand on the left side of the rear end with two M6 bolts (center distance 22mm).
Example) https://www.tyrellbike.com/webstore/products/details/41
Example) https://www.tyrellbike.com/webstore/products/details/41
Development Plans and Others
Is iruka patented?
Trademark, design, and patent rights for iruka’s frame structure have already been registered.
Will there be regular model changes?
No, we don’t have plans to make annual regular model/specification changes like other bicycle manufactures.
