Genuine Royal Enfield Shim Spindle 0.1T (Retrofit) | Bullet/Electra/Machismo/Thunderbird AVL-era | 112078/B

The Royal Enfield Shim Spindle 0.1T – Retrofit (Part No. 112078/B) is a genuine OEM shim used to correct/adjust fitment clearance in specific legacy Royal Enfield assemblies. Royal Enfield catalogs describe it as “SHIM SPINDLE 0.1T – RETROFIT”, and also show it as the replacement for part number 112078. 

Because shims are tolerance-critical, OEM accuracy matters: the correct shim thickness helps prevent unwanted play, noise, or accelerated wear that can happen when clearance is incorrect. Some sellers also note this shim spindle is used with the one-way starter motor on AVL models, making it a common “small part” that becomes essential during restoration or repair work. 

This is a low-cost, high-impact part—ideal to keep in stock for workshops and DIY rebuilders working on older platforms. To reduce wrong orders and returns, buy this only if your parts diagram/old part reference confirms 112078/B, or if your mechanic has specified this exact part number.

Key Features 

• Genuine Royal Enfield OEM part (factory-spec) 

• Part Number: 112078/B

• Official description: Shim Spindle 0.1T – Retrofit 

• Replacement/updated part shown for 112078 → 112078/B

• Helps correct clearance/tolerance in the intended assembly (shim application)

• Useful during overhaul/restoration of older Royal Enfield platforms

• Some dealers specify usage in one-way starter motor (AVL models) 

• Best practice: confirm by part number match before ordering

Compatibility Table 

Model fitment below is taken from dealer fitment lists for 112078-B / 112078/B. 

PLEASE CHECK PART NUMBER BEFORE PURCHASE

Variants

• Single part only: 112078/B (no LH/RH variant indicated) 

FAQs

Q1. What is 112078/B exactly?
It’s a Genuine Royal Enfield “Shim Spindle 0.1T – Retrofit” (OEM shim component). 

Q2. Is 112078 the same as 112078/B?
Royal Enfield listings show 112078 with a note to see the replacement part number, and list 112078/B as the active part. 

Q3. Where is this shim used?
It’s a shim used for clearance adjustment in certain assemblies. One seller specifies usage with the one-way starter motor in AVL models. Verify by part number/microfiche for your exact bike. 

Q4. Will it fit UCE / J-Series / 650 Twins / Himalayan?
Not confirmed by the sources used. This listing is restricted to the confirmed legacy models shown above. 

Q5. How many pieces should I order?
Depends on the assembly and measured clearance. Many workshops keep multiples because shim selection can be iterative.