Maxxis Rambler 700x50c

I used the Kenda Small Block Eight 29x2.1 tires for two years. During that time, they wore out. I decided to replace them with similar tires, but 120 TPI.

I bought the Maxxis Rambler 700x50c (50-622, equiv. to 29x2.0 in terms of MTB).

 

They are 120 TPI, foldable, of course.

 

 

Recommended pressure: 2.5-3.4bar (35-50psi)

Weight: 628g and 654g (each, without packaging).

See also related notes:

• Kenda Small Block Eight 29x2.1 tires (2024-06-23)

Image albums:

• Bicycle

Samsung NX 16/2.4: Samples [2] - APS-C - f/5.6

Camera: Samsung NX20 (1.5x crop factor, 20MP), Samsung NX300M (1.5x crop factor, 20MP), Samsung NX500 (1.5x crop factor, 28MP)

Lens: Samsung NX 16/2.4 at f/5.6 (24 mm equiv.)

The profiled lens correction is disabled in the raw converter.

(NX20)

(NX20)

(NX20)

(NX300M)

(NX500)

(NX20)

(NX500)

See also related notes:

• 16-20-30 (добавлен Samsung NX 16/2.4) (2012-11-09)

Image albums:

• Samsung NX 16/2.4

135-120 film adapters

These are two pairs of adapters to install 135 (35mm) film into a 120 film (medium format) camera.

Unfortunately, they are not compatible with my old Kiev-6S camera.

I successfully loaded a 35mm film, but when I cock the shutter, it goes very tight. I stopped because I was afraid of breaking something.

See also related notes:

• Kiev-6S: Budget medium format film camera (2025-06-11)

Image albums:

• Photographic film
• Kiev-6S

VIOFO A119 Mini 2: GPS module

The GPS module of the VIOFO A119 Mini 2 is also serves as a mount. Therefore, an additional GPS module must be purchased to mount the dash cam in a second car.

I bought a module claimed to be compatible with the VIOFO A119 Mini. However, it is exactly the same as the Mini 2's module.

And it works well with my VIOFO A119 Mini 2.

By the way, I use GPS for clock synchronization only.

See also related notes:

• VIOFO A119 Mini 2: My new dash cam (2026-02-09)

Image albums:

• Video

Kenda Small Block Eight 27.5x2.1: i19 vs i35

The Kenda Small Block Eight 27.5x2.1 tires mounted on different rims:

The left wheel has a 584x19 (i19 - 19mm internal) rim.

The right wheel has a 584x35 (i35 - 35mm internal) rim.

The tire carcass width:

i19: 52.1mm (2") at 4 bar (58 psi)

i35: 58.4mm (2.3") at 4 bar (58 psi)

The outer tire diameter is also slightly larger with the i35 rim.

See also related notes:

• Kenda Small Block Eight 27.5x2.1 tires (2025-07-31)

Image albums:

• Bicycle

Pentax Q 07 11.5/9 Mount Shield Lens: Samples [2] - 1/1.7" - f/9

Camera: Pentax Q7 (1/1.7", 12MP)

Lens: Pentax Q 07 11.5/9 Mount Shield Lens f/9 only (53mm equiv.)

The larger sensor provides better resolution in the center, but the area off-center is more blurred. The lens still needs light, with f/9 and 1/100.

(ISO 1250, Noisy!)

See also related notes:

• Pentax Q 07 11.5/9 Mount Shield Lens (2025-08-21)

Image albums:

• Pentax Q 07 11.5/9 Mount Shield Lens

MIT license for some of my projects

I have applied an MIT license to my projects:

724mix - OS/2 mixer for YMF724 [OS/2, 2000-2001]:

    https://github.com/malykhcom/724mix

Win95Key plug-in to control T&V HappyPlayer [OS/2, 2002]:

    https://github.com/malykhcom/w95k_tvh

malykh-geo-ep source code [Java, 2009-2010]:

    https://github.com/malykhcom/malykh-geo-ep

malykh-drb3-reader [GitHub]:

    https://github.com/malykhcom/malykh-drb3-reader

See also related notes:

• malykh-drb3-reader [GitHub] (2026-01-25)
• 724mix - OS/2 mixer for YMF724 [OS/2, 2000-2001] (2024-03-11)
• Win95Key plug-in to control T&V HappyPlayer [OS/2, 2002] (2024-01-19)
• malykh-geo-ep source code [Java, 2009-2010] (2023-12-15)

Shimano B05S: Disc brake pads

New disc brake pads Shimano B05S:

Old pads Shimano B01S (OEM from Cujo):

I am not sure whether the new pads are genuine or fake. They have worked well overall since I started using them in autumn. However, they sometimes squeak in rainy or snowy conditions.

See also related notes:

• Cannondale Cujo 1 (2018): компоненты и спецификация (2018-10-14)

Image albums:

• Bicycle

M39x1 extension tubes

I have several sets of M39x1 extension tubes.

1. Old four-tube set, USSR, KMZ (КМЗ).

Tube lengths: 5mm, 8mm, 16.4mm, 26mm.

2. Old four-tube set, USSR, FED (ФЭД).

The same tube lengths: 5mm, 8mm, 16.4mm, 26mm.

Why is the tube length 16.4 mm? This tube is used to mount earlier Zenit SLR M39x1/45.2 lenses to M39x1/28.8 rangefinder cameras: 45.2 - 28.8 = 16.4 (mm)

3. Modern three-tube set, China, no-name.

Tube length: 7mm, 14mm, 28mm.

These lengths were more common for M42x1 tubes, but now they are also used for M39x1.

See also related notes:

• Использование объективов M39x1 на цифровых камерах (2022-05-18)

Image albums:

• Lens accessories

Samsung NX 45/1.8: Samples [2] - APS-C

Camera: Samsung NX20 (1.5x crop factor, 20MP), Samsung NX300M (1.5x crop factor, 20MP), Samsung NX500 (1.5x crop factor, 28MP)

Lens: Samsung NX 45/1.8 at f/2.5-f/2.8 (68 mm equiv.)

The profiled lens correction is disabled in the raw converter.

(NX20, f/2.8)

(NX300M, f/2.8)

(NX300M, f/2.8)

(NX300M, f/2.8)

(NX500, f/2.8)

(NX300M, f/2.8)

(NX500, f/2.5)

See also related notes:

• NX 45/1.8 же (2013-07-03)

Image albums:

• Samsung NX 45/1.8

Flyxii FR-701: With large boots

The rear derailleur cable housing routes through the right chainstay of the Flyxii FR-701 frame.

This makes shifting easier because the cable moves more smoothly.

However, this creates an unexpected issue. If your shoes are large-sized or bulky, the heel of your right shoe may touch the cable housing.

This isn't an issue for me overall, but I have occasionally touched the cable housing several times in winter boots.

See also related notes:

• Flyxii FR-701 carbon frame (2026-01-23)

Image albums:

• Bicycle

Ricoh GR: F-numbers

My F-number statistics for all stored images that were taken with the Ricoh GR.

f/5.6: 5663 - 61.61%

f/2.8: 1557 - 16.94%

f/4.0: 566 - 6.16%

f/5.0: 491 - 5.34%

f/4.5: 464 - 5.05%

f/3.5: 182 - 1.98%

f/6.3: 113 - 1.23%

f/3.2: 103 - 1.12%

f/7.1: 36 - 0.39%

f/8.0: 6 - 0.07%

f/16.0: 6 - 0.07%

f/13.0: 2 - 0.02%

f/10.0: 1 - 0.01%

f/11.0: 1 - 0.01%

f/14.0: 1 - 0.01%

Total: 9192 images

I should note that I usually use the P mode. And the P mode of the Ricoh GR likes f/5.6 very much when there is enough light. Otherwise, it prefers f/2.8. Other F-numbers are not very popular, or I select them manually.

This makes me think that the Viltrox AF 28/4.5 (FE) lens only needs two aperture settings: fully open at f/4.5 and fully closed at f/8. Therefore, its aperture mechanism could be very simple.

See also related notes:

• Viltrox AF 28/4.5 (FE): Wide-angle pancake lens (2025-01-24)
• Ricoh GR: субъективные впечатления (2014-03-19)

Split crown race

The headset that came with the frame includes a fork crown race ring (39.8 mm). However, when I installed the headset, I used a split crown race instead.

A split crown race is easier to install and remove.

See also related notes:

• Flyxii FR-701: My new bike (2026-02-23)
• Flyxii FR-701: Included components (2026-02-07)
• Flyxii FR-701 carbon frame (2026-01-23)

Image albums:

• Bicycle

Anastigmat Victar 50/2.9: Samples [2] - FF - f/2.9

Camera: Sony a7c (FF, 24MP)

Lens: Anastigmat Victar 50/2.9 at f/2.9

See also related notes:

• Anastigmat Victar 50/2.9 (M40x1): Uncoated triplet from 1940s (2023-07-24)

Image albums:

• Victar 50/2.9

Race Face Chester: Flat pedals for winter

My new flat pedals for the winter season.

They are the Race Face Chester Yellow (PD20CHEYEL).

185g each (370g pair).

I have tried them out, and they are much better than my previous cheap ESLNF flat pedals, which had a lot of free play.

Image albums:

• Bicycle

http:// -> https://

All http-links to malykh.com and malykh.blogspot.com have been replaced with https-links in all posts.

Vittoria e-Barzo Trail 29x2.6: Tubeless mount

In 2019, I tried to make tires tubeless on a few occasions (see 1 and 2). However, the rims were not suitable for this.

This time, I have a different set of tires and wheels. So, I tried it again.

I installed these tire valve stems.

I used inexpensive "universal" (for bikes, motorcycles, cars, and so on) tire sealant. Since it is winter, I mixed the sealant with antifreeze/coolant.

It works well. I already rode 300+ km without any problems despite the cold weather. This may be due to the relatively low tire pressure. I use 1-1.5 bar (14-21 psi), or even less.

It will be interesting to see how it goes in the summer with the different tires I want to use.

See also related notes:

• Vittoria e-Barzo Trail 29x2.6 (2025-12-19)
• Koozer XM1850 (622x27) wheelset (2024-06-29)
• Антифриз Coolstream JPN (2020-04-10)
• Бескамерные покрышки на Cujo 1: вторая попытка (ободная лента и вентиль) (2019-09-13)
• Бескамерные покрышки на Cujo 1: первая попытка (2019-06-11)

Image albums:

• Bicycle

Pentax Q 01 8.5/1.9 Standard Prime: Samples [2] - 1/1.7" - f/1.9

Camera: Pentax Q (1/1.7", 12MP)

Lens: Pentax Q 01 8.5/1.9 Standard Prime at f/1.9 (39mm equiv.)

The profiled lens correction is disabled in the raw converter.

I was disappointed with this lens when used on the Pentax Q. However, the Pentax Q7, which has a larger sensor, produces better results. The angle of view is wider, and the resolution is higher. This combination is quite usable. One notable issue is distortion. I wish it were less.

See also related notes:

• Pentax Q 01 8.5/1.9 Standard Prime: Samples [1] - 1/2.3" - f/1.9 (2025-10-07)
• Pentax Q 01 8.5/1.9 Standard Prime (2025-09-23)

Image albums:

• Pentax Q 01 8.5/1.9 Standard Prime