2001 GMC Sierra 2500 HD Extended Cab Bolt Pattern
Checking fitment for your vehicle? Below you will find the factory bolt pattern (also known as the lug pattern) for the 2001 GMC Sierra 2500 HD Extended Cab, along with offset and center bore data.
| Bolt Pattern (Lug Pattern) | 8x165.1 (8x6.5") |
|---|---|
| Lug Nut / Bolt Size | 14x1.5 |
| Center Bore (CB) | 116.7 mm |
| Offset (ET) | 20-40 |
| Torque Specs | 140 ft-lbs (190 Nm) |
2001 Sierra 2500 HD Extended Cab — Year-Specific Fitment Context
The 2001 GMC Sierra 2500 HD Extended Cab is in year 3 of 12 using the 8x165.1 pattern (1999–2010). Wheels from any 1999–2010 GMC Sierra 2500 HD Extended Cab are cross-compatible with the 2001 model. Across its full production run (1999–2013), the Sierra 2500 HD Extended Cab has also used: 8x180.
GMC Sierra 2500 HD Extended Cab Bolt Pattern by Year
The table below shows how the Sierra 2500 HD Extended Cab's wheel specifications have changed over the years. The 2001 model year is highlighted.
| Year | Bolt Pattern | Center Bore | Offset |
|---|---|---|---|
| 1999 | 8x165.1 | 116.7 | 20-40 |
| 2000 | 8x165.1 | 116.7 | 20-40 |
| ▸ 2001 | 8x165.1 | 116.7 | 20-40 |
| 2002 | 8x165.1 | 116.7 | 20-40 |
| 2003 | 8x165.1 | 116.7 | 20-40 |
| 2004 | 8x165.1 | 116.7 | 20-40 |
| 2005 | 8x165.1 | 116.7 | 20-40 |
| 2006 | 8x165.1 | 116.7 | 20-40 |
| 2007 | 8x165.1 | 116.7 | 20-40 |
| 2008 | 8x165.1 | 116.7 | 20-40 |
| 2009 | 8x165.1 | 116.7 | 20-40 |
| 2010 | 8x165.1 | 116.7 | 20-40 |
| 2011 | 8x180 | 124.9 | 44 |
| 2012 | 8x180 | 124.9 | 44 |
| 2013 | 8x180 | 124.9 | 44 |
Fitment Notes
The 2001 GMC Sierra 2500 HD Extended Cab has a bolt pattern of 8x165.1.
Imperial Conversion: This bolt pattern is commonly referred to as 8x6.5" in imperial units. When searching for aftermarket wheels, you may see them listed as 8x6.5".
This means it is a 8 lug pattern with a circle diameter of 165.1mm. When shopping for aftermarket wheels, ensure the "lug pattern" or "PCD" matches these numbers.
Year-to-Year Fitment Context
In our dataset, GMC Sierra 2500 HD Extended Cab appears from 1999 to 2013 (15 model years).
Across model years, this model appears with 2 bolt patterns (8x165.1, 8x180).
- Observed bolt-pattern variants for this model: 2
- Observed center-bore variants for this model: 2
- Observed lug-size variants for this model: 1
- Observed total offset span across years: 84.0 mm
8x165.1 Pattern Context
This bolt pattern appears on 846 vehicles in our current database and is considered common.
Examples of other vehicles using 8x165.1:
2001 GMC Sierra 2500 HD Extended Cab — Frequently Asked Questions
What is the bolt pattern for a 2001 GMC Sierra 2500 HD Extended Cab?
The 2001 GMC Sierra 2500 HD Extended Cab uses a 8x165.1 bolt pattern (also called lug pattern or PCD). The center bore is 116.7mm and the offset is 20-40mm.
What other years of GMC Sierra 2500 HD Extended Cab have the same bolt pattern as the 2001?
The GMC Sierra 2500 HD Extended Cab uses the 8x165.1 pattern from 1999 through 2010. Wheels from any of these model years are dimensionally compatible with the 2001, provided the offset and center bore also match.
What lug nut size does the 2001 GMC Sierra 2500 HD Extended Cab use?
The 2001 GMC Sierra 2500 HD Extended Cab uses 14x1.5 lug nuts. Always verify the thread pitch and seat type (cone, ball, or flat) match your aftermarket wheels.
How do I measure the bolt pattern on my 2001 GMC?
The 2001 Sierra 2500 HD Extended Cab uses a 8x165.1 pattern. For 4, 6, or 8-lug wheels, measure center-to-center across opposite holes. For 5-lug, measure from the center of one hole to the back of the opposite hole.
What does 20-40mm offset mean for the 2001 Sierra 2500 HD Extended Cab?
An offset of 20-40mm means the wheel's mounting surface is 20-40mm away from its centerline. Changing this value drastically can affect suspension geometry and wheel bearing wear on your GMC.
What is the factory wheel offset for a 2001 GMC Sierra 2500 HD Extended Cab?
The OEM offset for the 2001 Sierra 2500 HD Extended Cab is typically around 20-40mm. Depending on wheel width, a deviation of ±5mm is usually acceptable, but verify suspension clearance.
Fitment Checklist Before You Buy Wheels
- This fitment uses a wide offset range. Check brake clearance and fender clearance before buying wheels.
- Torque lugs in a star pattern to 140 ft-lbs (190 Nm), then re-check torque after 50-100 km (30-60 miles).
- This model has multiple bolt-pattern records across years. Match wheels to exact year/trim before purchase.
Editorial Fitment Notes
GMC Sierra 2500 HD Extended Cab has multiple wheel-fitment records across generations, so matching exact year and trim is important before ordering wheels.
- Observed production years in our database: 1999-2013 (15 model years).
- Observed bolt-pattern variants: 2 (8x165.1, 8x180).
- Observed total offset span across years: 84.0 mm.
- Observed center-bore variants: 2 | lug-size variants: 1.
Data Quality & Review
Source note: Compiled from manufacturer fitment references, historical wheel data, and internal normalization rules.
Last reviewed: 2026-05-26 | Reviewed by: Bolt Pattern HQ Editorial Team
If you find a discrepancy for 2001 GMC Sierra 2500 HD Extended Cab, please report it via our About page contact so we can verify and update this record.