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Official part 4719 : part variation problem ? - Printable Version

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Official part 4719 : part variation problem ? - Bertrand Lequy - 2026-01-25

Hello, I'm still sorting some things out with LDraw parts on RB and I have a question about the part 4719.

apparently two mold variations exist with three different ways of naming them according to RB.

- the 80's version, with a normal stud over the rear wheel and a normal hollowed stud over the front wheel named 4719 :
[Image: 4719-4-af7cb56f-d1bd-4d1c-8441-49ad88ca7cf0.jpg]
- the actual version, with a hollowed over the rear wheel and a reinforced hollowed stud over the front wheel named 4719 or 65574 :
[Image: 65574-4-b7a268dc-edf9-4432-b109-0659317ea52c.jpg]
The problem is that the part on the part tracker seems to be a mix of both mold.

Should we fix it, and how ?
- do nothing ?
- 4719 for the old one and 65574 for the new one ?
- 4719 for the old one and 4719a for the new one ?
- 4719 for the new one and 4719a for the old one ?
- something else ?

Thank you.

RE: Official part 4719 : part variation problem ? - Philippe Hurbain - 2026-01-25

According to RB chart (https://rebrickable.com/parts/65574/bicycle-frame-reinforced-headlight-hollow-stud/, page bottom), there is a rather sharp transition in 2012 between 4719 and 65574. Most 3D meshes from LEGO use 4719 reference. The older ones (LDD) appear with plain stud/normal front stud, while the most recent ones (BIs rev>2) use hollow stud/reinforced front stud.
So I think we should correct 4719 with a plain stud, and create 65574 with hollow stud/reinforced front stud.

RE: Official part 4719 : part variation problem ? - Gerald Lasser - 2026-01-25

Both meshes are on BI as 4719, but with a different versioning, A is the old one, B and above is the modern one.

RE: Official part 4719 : part variation problem ? - Chris Böhnke - 2026-01-26

Are they identical otherwise?

I agree the current one does not exist.

However I am beginning to believe there are more versions:
  • Original Version is 4719(a), which was always found in Assembly 73537 (1985-2007?). Did the first batches of Cafe Corner still come with this? If not this was likely discontinued around 2004. The wheels for this have no known number, but LDD lists them as "64248 - TYRE AND WHEEL, VIRTUEL". Most common in Red and Black, but also available in White, Yellow and Dark Pink (Team Telekom)
  • The first bicycles which shipped disassembled first appeared in City in 2009, but might have been in Educational Sets a bit earlier. Brickset lists this as 4719 as well, but LDD has them as 33485. Colours Red, Green, White, Medium Azur and Bright Light Orange. his might have already had the revised studs. Any proof of Green bicycles with the old stud types out there (colour should be exclusive to the type)? The new (?) Wheels are listed as 28578, but the number 92851 exists as well. Note that these are dual-molded unlike the older ones with removable tires.
  • The current version seems to be 65574, which came in 8 colours thus far: Red, Yellow, Black, Magenta, Medium Azur, Dark Azur, Bright Green, Br. Light Yellow. It still seems to use the same wheels 28578, however there might have been a minor change a couple years ago as Element 6503209. Also note that according to Brickset/Lego.com, the 65574 did not appear in regular Sets (= not Educational) before 2020.

Since the assembly will likely need a new library entry as well, I think we should use 73537 for the old one here too.

RE: Official part 4719 : part variation problem ? - Gerald Lasser - 2026-01-26

(2026-01-26, 0:02)Chris Böhnke Wrote: Are they identical otherwise?

I agree the current one does not exist.

However I am beginning to believe there are more versions:
  • Original Version is 4719(a), which was always found in Assembly 73537 (1985-2007?). Did the first batches of Cafe Corner still come with this? If not this was likely discontinued around 2004. The wheels for this have no known number, but LDD lists them as "64248 - TYRE AND WHEEL, VIRTUEL". Most common in Red and Black, but also available in White, Yellow and Dark Pink (Team Telekom)
  • The first bicycles which shipped disassembled first appeared in City in 2009, but might have been in Educational Sets a bit earlier. Brickset lists this as 4719 as well, but LDD has them as 33485. Colours Red, Green, White, Medium Azur and Bright Light Orange. his might have already had the revised studs. Any proof of Green bicycles with the old stud types out there (colour should be exclusive to the type)? The new (?) Wheels are listed as 28578, but the number 92851 exists as well. Note that these are dual-molded unlike the older ones with removable tires.
  • The current version seems to be 65574, which came in 8 colours thus far: Red, Yellow, Black, Magenta, Medium Azur, Dark Azur, Bright Green, Br. Light Yellow. It still seems to use the same wheels 28578, however there might have been a minor change a couple years ago as Element 6503209. Also note that according to Brickset/Lego.com, the 65574 did not appear in regular Sets (= not Educational) before 2020.

Since the assembly will likely need a new library entry as well, I think we should use 73537 for the old one here too.

Didn't they ship assembled first? The mesh has no indent at the wheelholders to allow for an easy sliding in of the wheel

RE: Official part 4719 : part variation problem ? - Chris Böhnke - 2026-01-26

Yes, that's the assembly 73537.

I couldn't verify exactly, but seems this was made from 1985 to either 2001 (Metroliner Re-Release) or 2007 (Cafe Corner).

There were also a couple Educational/Dacta sets with bicycles during that era, but since those even changed motorbikes for trikes (amongst other parts), I wouldn't count these as "reliable source".


The wheel indent sounds logical - I assume then this is 33485/4719(b) from 2009 (First seen in Set 7639)?