Description
MIDDLEBURN, a British crank brand, offers sophisticated forged aluminum cranks that have been improved many times since 1991, and in recent years have evolved using modern technology such as 3D modeling. They guarantee to be the stiffest cranks on the market, yet lightweight.
RO1 SQ double road spider is made of "A7075", an aluminum alloy that is used in the aerospace industry.The material is manufactured through forging and CNC machining.
The unique lock ring shape is used, RO1 Square Taper Crank andrequired to install the RS7 Square Taper Crank . It is compatible with both single and double front cranks.
A colorful addition to a rugged crank, the MEDIUM / Medium Alloy Cup Crank Bolts Set is the perfect choice.
MADE IN THE UK
[SPEC]
Material: A7075 T6 Aluminum
BCD: 94mm, 110mm
Weight: BCD 94mm 45g, BCD 110mm 62g
Chainline (2x ring center): approx. 43.5mm for 107mm BB axle length, approx. 49mm for 118mm BB axle length
Chainline (1x outer side): approx. (1 x outer side): approx. 47mm for 107mm BB shaft length, approx. 52.5mm for 118mm BB shaft length
*Please purchase MIDDLEBURN RO1 Square Taper Crank andRS7 Square Taper Crank as well, since they use our original lock ring shape.
- Orders are shipped within 1–2 business days after payment is confirmed. Orders placed by 10:00 AM are generally shipped the same day.
- Messenger delivery is available within Nagoya City only (excluding complete bikes and framesets).
- We ship every day from Monday through Sunday, except on temporary closure days.
- Shipping destinations: throughout Japan and worldwide.
- Shipment may be delayed depending on credit card processing. If you would like to request a delivery date or time, please add a note in your cart.
- All orders are shipped from Circles.
- For damage or loss during transit, please contact the carrier.
Complete Bike Shipping within Japan
- A shipping fee of ¥9,900 (tax included) applies to complete bikes. Additional charges may apply for Okinawa and remote islands.
- After purchase, we perform a final inspection before shipping. Please allow 1–2 weeks in some cases.
- For packing, some parts may be removed. We strongly recommend having the bike reassembled and checked by your local bicycle shop before riding.
- We will contact you by email with delivery details.
- Products are also sold in-store, so availability may change before the order is finalized.
Frameset Shipping within Japan
- Flat-rate shipping within Japan: ¥5,500 (tax included). Additional charges may apply for Okinawa and remote islands.
- Shipping rates for OMNIUM framesets and complete bikes differ.
- We will contact you by email with delivery details.
- Facing and tapping preparation for framesets purchased from Circles is available at no additional charge. Details will be provided after purchase.
- Headset and bottom bracket installation are also available for an additional labor fee. Please contact us if required.
Custom & Stock Wheel Shipping within Japan
- A shipping fee of ¥2,000 (tax included) applies. Additional charges may apply for Okinawa and remote islands.
- Stock wheels undergo a final inspection by a mechanic before shipping. Please allow approximately 3 business days for dispatch.
For international orders, shipping costs vary by destination. Please check the amount shown at checkout.