Tire Evaluation – Surly Larry 27 TPI

The Surly Larry is offered in either a folding bead 120 TPI plus a cord bead 27 TPI model. Since the cost difference between these variations is rather large, it is fascinating to compare the two and determine just how much you are losing when moving with the less expensive version. When considering the specifications of both the 120 TPI and 27 TPI variations, the most apparent distinction is that the much higher weight of this less costly version: 1567 g Vs 1256 g. Search for bike tire pump adapter in order to know more about bicycle pumps.

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Except for the considerably higher weight of this 27 TPI variant, the two versions seem to be indistinguishable when fitted to the bicycle. The one thing which makes it clear you are running the 27 TPI variant is that the little “27 tpi” printing onto the sidewalls of the tires. Regrettably, Surly does not provide a whole lot of technical facts about their own tires. I could not find any info regarding the compounds utilized on these tires, so I am not certain whether the differences found in the evaluations come in the casing or the chemical.

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All rolling resistance evaluations are conducted on our rolling resistance test system. Read our The Evaluation page for a detailed explanation about how we examine tires.

Do not forget to have a look at the review pages to make it simpler to compare all of tires which were examined.

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As stated earlier, the largest difference is that the much higher burden of this 27 TPI variant. After measuring the two tires, the distinction is much larger as my sample of this 120 TPI variation came in under the designated weight and also the 27 TPI variation came in somewhat heftier than the specified pounds: 1660 g Vs 1567 g) When matching both the 120 TPI and 27 TPI variation to a 65 C rim, inflated to 16psi, the 27 TPI variant ends up marginally bigger with a maximum casing diameter and height of both 95 and 81 mm (the 120 TPI Larry came in at 93 and 80 mm).

After measuring the depth of the casing of both tires, it will become apparent why the 27 TPI conveys that much more fat: the sidewalls and tread segment of those 27 TPI Larry are substantially thicker. The sidewalls of the 27 TPI variant have a depth of 1.3 mm (120 TPI = 0.9 mm). The tread segment of this bicycle has a depth of 2.9 mm (120 TPI = 2.5 mm). The height of these knobs is exactly the exact same for both the 27 and 120 TPI models.

As anticipated, the 27 TPI variant has a higher rolling resistance compared to the more expensive and milder 120 TPI Larry (read review), however, the drawback is not as large as I’d anticipated. Normally, it seems rolling resistance of this 27 TPI Larry is near 10 – 15 % higher over the various air pressures.

While rolling resistance is not that much higher compared to 120 TPI Larry, it has to be stated the 120 TPI Larry did not work that well in the rolling resistance evaluation in the first location. When comparing the 27 TPI Larry using the much quicker Schwalbe Jumbo Jim, rolling resistance is near 50% greater.

From the puncture resistance evaluations, the 27 TPI Larry scores almost exactly like the 120 TPI Larry in both the tread and sidewall evaluations.

The same as the 120 TPI edition of this Larry, I am not impressed with this more economical 27 TPI variant. Weight is far too large for me to look at this scooter and to make things worse, comes from over the designated weight by almost 100 g. I can not recommend this scooter since even though this can be a more affordable option to the 120 TPI Larry, it is more costly than other high of the lineup, better performing tires from some other makers.

If you would like to compare all information of this 27 TPI and 120 TPI Larry side by side, proceed here: Larry 120 TPI Vs Larry 27 TPI side by side comparison have a peek at the fat bicycle overview page to determine which tires perform much better on our evaluations.

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