info@oldtimerteile.net | +49-2599-92210 | Mon – Fri, 8:00 am – 12:30 pm

Lock block

BMW 700 transmission

Lock block Zoom

Lock block

€9.95

incl. 19% VAT plus shipping

1. gear
Technical data
Category
BMW 700 transmission
BMW part number
23231031721
Item number
B7-05-057
Weight
0 kg
In stock

No instant purchase: after your request you will receive a personal quote including shipping costs.

Philipp Schäper
Philipp Schäper BMW Isetta specialist Question about this item?
In stock Almost all parts available directly from stock
Original parts Original parts from workshop inventory
Specialists The specialists for BMW Isetta, 600 & 700
Worldwide shipping By DHL, UPS or freight forwarder — safely packed
Application

A lock pawl in a synchronized transmission works in conjunction with the lock band and synchronizer ring to control the engagement of the shift sleeve, ensuring that the gear is safely engaged only after the rotational speeds have been equalized.

Share

Questions & Answers

No questions about this item yet. Feel free to ask the first one.

Please sign in to ask a question about this item. Alternatively, you can reach us via the contact form.

Sign in Register To the contact form

General information about this item

Product info
The B7-05-057 synchronizer ring for first gear in the BMW 700 transmission aids synchronization and ensures that the gear engages securely only after the rotational speeds have balanced out. During a professional restoration of the transmission, worn synchronizer rings should always be replaced to prevent grinding noises and gear slippage in first gear. The interaction with the synchronizer ring and synchronizer band is crucial for consistently smooth shifting.

Database ID: 4746 Accessed on: 17.06.2026 22:03 Data state: 22.05.2026 12:33 In stock since: 18.11.2025