Akonzi omwe amakonda kwambiri zida amasankha chilichonse chomwe timapereka. Mukagula kudzera pa ulalo, titha kupeza ma komisheni. Timayesa bwanji zida.
Mfundo zazikuluzikulu: Kuyimitsidwa kosavuta, kophatikizana, kosavuta kugwiritsa ntchito, komanso koyendetsedwa kokha kumapereka okwera omwe akufuna: kuyimitsidwa kolimba pamene kuli kokhazikika, ndi kuyimitsidwa kotseguka pamene akugunda kapena kutsika.
Mtengo: US$9,500 mpaka US$12,500, kutengera mtundu wanjinga. Kulemera kwake: Ogwira ntchito m’ndege anawonjezera kulemera kwa njingayo ndi magalamu 308.
Flight attendant (FA) ndi chowonjezera chamagetsi pazigawo zina za RockShox zoyimitsidwa. Dongosololi lili ndi magulu atatu a sensa opanda zingwe-imodzi mu foloko, imodzi mu chotsekereza chododometsa, ndi ina mu crank-ndi ma actuators apakompyuta mu foloko ndi shock absorber, yomwe imatha kusintha ma damping mode. Pakubwereza koyamba, FA itha kugwiritsidwa ntchito ngati foloko yakutsogolo ndi njira yoyamwitsa yanjinga yoyimitsidwa.
M'njira yodziwikiratu, FA imagwiritsa ntchito magulu ake atatu a sensa kuti asonkhanitse zidziwitso kuchokera kumawilo, ngati njinga ili kumtunda kapena kutsika, ndi kuyika kwa wokwerayo, ndipo imapereka chidziwitsochi kudzera mu algorithm yosankha imodzi mwamitundu itatu yakutsogolo ndi mayamwidwe odabwitsa. Zotseguka, zoponda, zolimba. RockShox inanena kuti oyendetsa ndege "amasankha kuyimitsidwa pama milliseconds asanu aliwonse," koma sandiuza kuti makinawo angasinthire mwachangu bwanji. Koma tikudziwa kuti makina a FA kwenikweni ndi mota, yomwe imatha kutembenuza chosinthira korona kutsogolo kwa foloko ndi cholumikizira cholumikizira chonyamulira, kotero kuti kusinthana sikuchitika nthawi yomweyo.
A Jon Cancellier, woyang'anira malonda a RockShox, adati momwe woyendetsa ndegeyo amawonera mtunda ndi "otseguka ndizomwe timakonda: ndizotetezeka, zodziwikiratu, komanso zomasuka. Tikugwiritsa ntchito dongosolo kuti tipange chisankho kuti tisakhale omasuka. Momwe ma aligorivimu amachitira Chidziwitso cholandilidwa: Ichi ndiye chinsinsi. Izi ndi zomwe takhala tikuchita maola masauzande ambiri. ”
Wothandizira paulendo wa pandege makamaka amagwira ntchito yothamanga kwambiri, ngakhale nthawi zina (makamaka pedal ndi loko) imagwira ntchito mothamanga kwambiri. Izo sizisintha rebound damping kapena kasupe kuuma kwa kuyimitsidwa. Kawirikawiri, dongosololi limasankha njira yofanana ya foloko ndi kuyimitsidwa, koma nthawi zina, ikhoza kulowa mugawo logawanika: kutsegula foloko / kuyimitsidwa kwa pedal kapena kuyendetsa foloko / kuyimitsidwa kwa loko.
Wokwerayo amatha kuzimitsa njira yodziwikiratu ndikusintha pamanja pakati pamitundu itatu pogwiritsa ntchito chowongolera chakutali kapena zowongolera pa korona wa foloko. Pamene ali mu mode basi, wokwera akhoza kutseka pamanja kuyimitsidwa kudzera chogwirizira chowongolera kutali, ndipo amangofunika khama pang'ono kuposa mode basi. Dongosololi limakhalabe munjira yopitilira / loko mpaka wokwerayo atembenuza chowongolera chakutali kuti chibwerere kumayendedwe odziwikiratu.
Chigawo cha FA chikatumizidwa kuchokera kufakitale, mawonekedwe ophatikizika amayikidwa kuti atseke, koma wokwerayo amatha kusintha mawonekedwe ophatikizika kuti atsegule kapena kupondaponda kudzera pa SRAM's AXS application.
Kuthamanga kwa mpweya, kuchuluka kwa magawo (pogwiritsa ntchito voliyumu shims / tokeni) ndi kubwezeretsanso kungasinthidwe ngati zinthu zoyimitsidwa za RockShox. Kuphatikiza apo, pali 10 pafupifupi kutsika kothamanga kwapang'onopang'ono kutsogolo kwa foloko ndi chotsitsa chododometsa, mutha kugwiritsa ntchito chowongolera cha foloko kapena pulogalamu ya SRAM's AXS kuti musinthe.
Kusintha kwina ndiko "kukondera". Kukonzekera koyenera kumatanthauza kuti dongosololi likhoza kutseka; kukhazikitsidwa kwa tsankho loyipa kumatanthauza kuti dongosololi limakhala pamayendedwe pafupipafupi.
Kugwiritsa ntchito oyendetsa ndege sikufuna kugwiritsa ntchito AXS, ndipo zosintha zambiri zitha kuchitika kudzera pa chowongolera cha foloko.
Mutha kuyimitsa kuyimitsidwa ndikuyimitsidwanso ngati njinga ina iliyonse yoyimitsidwa. Mukayika izi, mutha kuwongolera masitepe awiri. Pambuyo poyesa, mutha kukwera: makinawo adzachita ntchito yake yokha. Dongosolo limadzuka likazindikira kusuntha, ndipo limangogona njinga ikangoyima kwa mphindi zingapo.
Dongosololi likakhala pawokha, mutha kugwiritsa ntchito chowongolera chowongolera cha SRAM's AXS kuyambitsa zotsekera-mwachitsanzo, ngati mukufuna kuthamanga. Mutha kuyikanso woyendetsa ndegeyo kuti aziyenda pamanja ndikugwiritsa ntchito chowongolera kuti azizungulira pakati pamitundu itatu: pakadali pano, mitundu ya foloko ndi ma vibration amalumikizidwa.
Foloko yakutsogolo ya FA ndi cholumikizira chododometsa chimagwiritsa ntchito batire lomwelo (ndi charger) monga kutumiza kwa SRAM's AXS ndi Reverb AXS kukweza mpando: sensa ya cadence imagwiritsa ntchito mabatire a lithiamu AAA, ndipo chowongolera chowongolera chimagwiritsa ntchito mabatire a CR2032. Moyo wa batri womwe SRAM umanena ndi:
Pali njira imodzi yokha yodzidzimutsa yoyendetsa ndege: Super Deluxe Air. Kutsogolo, pali njira yothandizira ndege ya Parker, Lyrik ndi mafoloko a Zeb. Zeb ndi mtundu waposachedwa wa foloko yamakono, pomwe Lyrik ndi Pike onse ndi mafoloko atsopano akutsogolo okhala ndi chassis yatsopano, akasupe a mpweya wabwino komanso kukangana kochepa. Kachipangizo kamene kamakhala ndi XX1 ndi X01 cranks (165 mm, 170 mm kapena 175 mm kutalika, ndi 30T, 32T, 34T kapena 36T mphete). RockShox idanenanso kuti zida zakunja zomwe zili ndi oyendetsa ndege zatsala pang'ono kuwonekera.
Pakali pano, njira yokhayo yopezera woyendetsa ndege ndikugula njinga yokhala ndi dongosololi. Pa nthawi yotsegulira, panali njinga zisanu ndi imodzi kuchokera ku mitundu inayi. (Njinga za Canyon za FA sizigulitsidwa ku United States).
Othandizira oyendetsa ndege safuna zida zilizonse zoyikiramo mwapadera, kotero opanga njinga amatha kuyika makinawo pamafelemu awo omwe alipo kapena atsopano mosavuta, ngati angafune. Popeza mtunduwo umagwira ntchito limodzi ndi RockShox kuti usinthe bwino panjinga zake ndikuwonetsetsa kuti magawo a FA achotsedwa pa chimango, zida za oyendetsa ndege pakadali pano sizigulitsidwa pamsika, ngakhale zitayikidwa panjinga zomwe zili ndi dongosololi. Kuphatikiza apo, palibe mapulani operekera zida zokwezera za FA pazinthu zoyimitsidwa za RockShox.
Othandizira oyendetsa ndege adabweretsa zosintha zingapo za foloko. Pakadali pano, zosinthazi zimangopezeka pamitundu ya RockShox yokhala ndi oyendetsa ndege, ngakhale ndikukayikira kuti posachedwa alowa mafoloko omwe si a FA. Dziwaninso kuti Zeb yokhala ndi FA ndikusintha kwa foloko yamakono, pomwe Lyrik FA ndi Pike FA onse ndi mafoloko atsopano.
Buttercups - Pali ma discs a rabara mu nyumba ya golide ya aluminiyamu yomwe ili kumapeto kwa shaft yonyowa, yomwe akuti imalepheretsa 20% ya kugwedezeka kwamphamvu kwambiri.
DebonAir + - Voliyumu ya akasupe amphepo abwino komanso oyipa a RockShox amasinthidwanso. RockShox imati m'badwo uno umapereka "mabampu ang'onoang'ono ofanana ndi batala, chithandizo chowonjezereka paulendo wonse, komanso kukwera kwamtunda wonse." Kusinthaku kuli ndi tanthauzo losiyana mu Zeb kuposa Pike ndi Lyrik. Ku Zeb, RockShox "kwambiri" idakulitsa kukula kwa kasupe woyipa wa mpweya ndikuchepetsa kukangana kwa masika. Cancellier adati mutu wonse wa Pike ndi Lyrik watsopano ndikuchepetsa kukangana, ndipo DebonAir + mu mafoloko awa "ndi kasupe watsopano wa mpweya wopangidwira [Pike ndi Lyrik] watsopano."
Valavu yothandizira kupanikizika-valavu ya batani kumbuyo kwa mwendo wa foloko imatulutsa mpweya wothamanga kwambiri-womwe umachitika chifukwa cha kusintha kwa msinkhu kapena mpweya wokhazikika m'munsi mwa mphanda. Lingaliro lomwelo monga valavu yotulutsa mpweya yomwe idayambitsidwa mu Fox 36, 38 ndi 40 mafoloko aposachedwa.
"Rigidity reducer" -RockShox ankaganizira kapu ya torque popanga chubu chapansi. Izi ndi zipewa zazikulu zokhala ndi mainchesi omwe amawonjezera mawonekedwe a foloko / hub, (kampaniyo imati) imapangitsa kuuma komanso kuwongolera bwino. Ngati hub yanu ilibe kapu ya torque, zingakhale zovuta kugwirizanitsa malowo ndikuyika thimble. RockShox tsopano ikugwirizana ndi ma gaskets ang'onoang'ono ochotsedwa, kupangitsa kuti ikhale yosavuta kugwirizanitsa malowa ndi kapu yomaliza ndi mbiya.
Kuphatikiza pa njira zapamsewu, ma e-njinga, ndi zosankha zamalonda, SRAM imathanso kuchita zinthu zambiri ndi oyendetsa ndege.
Pakadali pano, FA saganiziranso zambiri kuchokera ku SRAM's AXS drive system, malo a AXS kukweza mpando, kapena mita yamagetsi. Sindingachitire mwina koma kuganiza kuti FA akhoza kupanga chisankho bwino ngati akudziwa kuti inu basi anasiya udindo wanu, kapena ngati inu pedal mopepuka pa 90 Watts m'malo sprinting pa 1000 Watts. Kuphatikiza apo, popeza njinga zambiri zimakhala ndi zinthu zambiri zotsutsana ndi squatting pamagiya otsika komanso zochepa pamagiya apamwamba, zida zomwe mumaponda zimathanso kudziwitsa FA mode.
Live Valve ndi makina opangira mawaya omwe amafunikira zida zambiri kuti ziyikidwe pamasensa osiyanasiyana ndi mapaketi a batri, kotero mtunduwo uyenera kupanga chimango kuzungulira dongosolo. Wothandizira ndege safuna malo olumikizirana mwachizolowezi, chifukwa chake amatha kuyika pafupifupi chimango chilichonse. Komabe, woyendetsa ndegeyo ali ndi mabatire atatu, pomwe batire ya Live Valve ndi 1.
Live Valve imasintha mitundu mkati mwa ma milliseconds atatu. Malinga ndi zomwe ndakumana nazo, izi zimathamanga kwambiri kuposa kuchedwa kwa woyendetsa ndege.
Malinga ndi malingaliro anga onse awiri, mitundu iyi imayandikira machitidwe awo kuchokera kumakona osiyanasiyana: kuyika kosasinthika kwa oyendetsa ndege ndikutsegula ndikuyang'ana chifukwa chotsekera, pomwe kusakhazikika kwa Live Valve ndikutseka ndikuyang'ana chifukwa chotsegulira. .
Wothandizira ndege ndiye njira yomaliza ya ndodo yokwera panjira yotseguka: pangani kuyimitsidwa kuti ikhale yolimba kuti igwirizane ndi kukwera ndi mayendedwe osalala, ndikutseguka kuti igwirizane ndi mabampu ndi kutsika. Koma woyendetsa ndegeyo azichita izi mwachangu, komanso pafupipafupi kuposa momwe wokwerayo amapangira pamanja pa foloko ndi lever yoyimitsa.
Live Valve imapangitsa kuyimitsidwa kukhala kolimba pamalo athyathyathya, koma chifukwa valavu ya solenoid ya Live Valve ndiyothamanga kwambiri, imasintha masinthidwe mwachangu komanso pafupipafupi kuposa oyendetsa ndege. Live Valve imatha kusintha mitundu muzochitika zonse: kukwera ndi kutsika, kutsetsereka komanso kuyenda. Ngati ikuwona kuti mwadumphira pansi, imatha kusinthanso mawonekedwe mumlengalenga.
Mamembala atatu a gulu loyeserera panjinga akhala nthawi yayitali panjinga zokhala ndi anthu oyendetsa ndege. Tara ndi Dan adakhala tsiku lonse atakwera zida za FA-Specialized Enduro ndi YT Capra pamayendedwe aku Pennsylvania, ndipo ndidakwera nane pa YT Capra Uncaged 6 ku Durango pafupifupi milungu ingapo (ngakhale nthawi yanga yokwera idachepetsedwa ndi Shortened) yokhudzidwa ndi nyengo. ndi matenda).
Ndikuchita mayeso anthawi yake kuti ndiwone ngati FA ikukumana ndi mawu a RockShox akuti "mudzakwera kutali, mwachangu komanso kudya mphamvu zochepa" kukwera njinga ndi oyendetsa ndege: chonde munkhani yotsatira ya "Njinga" Yang'anani izi. Pa nthawi yomweyo, ichi ndi maganizo athu kukwera.
Dan: Ndangokwerapo woyendetsa ndege wa SRAM panjinga yanga yatsopano kawiri, kotero ngakhale ndikufuna kutayika kwathunthu m'tsogolo la kuyimitsidwa kwa njinga zoyendetsedwa ndi makompyuta. Ndidzamamatira kukufotokozera kwanga mwachidule momwe dongosololi limagwirira ntchito pa S-Works Enduro.
Mwachidule, woyang'anira ntchito amagwira ntchito bwino kwambiri. Ndikadapanda kusamala kwambiri ndi zomwe dongosololi likuchita komanso zachilendo zake, ndikadatha kusiyiratu kuganiza za izi. Zimapangitsa kuti njinga yopirira ya 170mm ikhale yogwira mtima ndikakhala ndi zero. Momwe dongosololi lidandifotokozera ndikuti mawonekedwe osasinthika ali "pa". Kwenikweni, dongosololi lidzayang'ana zifukwa zolimbikitsira kuyimitsidwa mukakwera. Nditha kusintha kupatuka kwa algorithm mu ma increments asanu kuti ikhale yotseka mwachangu kapena pang'onopang'ono. Mosasamala zokonda, sindingathe kunyenga dongosolo kuti lichite zinthu zomwe sindikufuna kuti lizichita. Kwa okwera omwe akuganiza kuti angathe, pali ndondomeko yamanja. Koma pofika nthawiyo, makinawa akhala chida chokhoma opanda zingwe pakompyuta, ndipo wothamanga wa XC m'malingaliro mwanga amamva chizungulire kwambiri ndi chiyembekezo ichi. Ndikuganiza kuti oyendetsa ndege adzapereka chithandizo chambiri kwa apanjinga apakatikati ndi aatali omwe alibe chidwi ndi sitimayi.
Tara: Wothandizira ndege yemwe adangokhala ola limodzi kapena kuposerapo adavutika kuweruza zonse ndikulengeza ngati anali wopambana kapena wolephera, ndiye chonde lingalirani zomwe ndidawona koyamba. Mwachiwonekere, SRAM yachita ntchito zambiri zofufuza ndi chitukuko papulatifomu. Zimapangitsa anthu kuganiza kuti ndi chinthu chamakono komanso chopukutidwa. Sichimathamangitsidwa kumsika kuti mupangitse chidwi kapena kuti mukhale ndi zatsopano zotentha. Ndizowoneka bwino, zimagwiritsa ntchito pulogalamu yam'manja ya SRAM yomwe ilipo komanso yowoneka bwino, ndipo imamva kuti yaphatikizidwa mu njinga. Izi ndi zofunika poganizira ngati ndalama mu dongosolo.
Panjirayo, dongosololi limagwira ntchito monga momwe RockShox idalonjezedwa. Poloza kutsika, idzatsegula; poloza chokwera, chimalimba. Komabe, sikuti ntchito yotseka yokha pakompyuta yokha; ingathenso kubwezera kusintha kwa malo pamene mukukwera. Ndi kukwera ndi kutsika kulikonse panjira, kapena miyala yaying'ono kapena mizu yamitengo ikugwedezeka, mutha kumva kusiyana kwa kuyimitsidwa kwa njinga.
Pokwera njinga m’tinjira tapang’onopang’ono, zochindikala papaki yanjinga kum’mawa kwa Pennsylvania, oyang’anira pandege ankawoneka kuti akusintha mwachangu popanda kuwongolerako kung’ono ndi kokwiyitsa komwe ndimayembekezera. Ndinabadwa wopanda talente yokwera njinga, choncho nthawi zambiri thandizo lililonse lomwe ndingapeze limayamikiridwa. Chifukwa ndilibe nthawi yochuluka kukwera FA, Ine sindiri wotsimikiza ngati zimandipangitsa kukwera mofulumira kapena wodziwa. Kuphatikiza apo, ndikufuna kuyendetsa dongosololi m'misewu yotakata, kuyendetsa mothamanga kwambiri m'miyala yambiri, mabampu a brake, ndi ngozi zapakatikati mpaka zazikulu, kuti ndiwone ngati malingaliro anga a oyendetsa ndege angasinthe.
Kumva kuti dongosololi limayendetsa njira iliyonse kumabweretsanso phokoso, lomwe kwa ine limakwiyitsa pang'ono komanso mwadzidzidzi. Ngakhale tsopano ndikuyembekezera phokoso la "whoop" ndi "dinani" la drivetrain yanga yomwe idakhazikika pagiya kudzera pa eTap (kapena tsopano positi yanga yatsitsidwa), sindimayembekezera kuti ndimva kuyimitsidwa kwanga . Tsoka ilo, chifukwa dongosololi limagwira ntchito nthawi zonse, mudzamva *nthawi iliyonse * * mukasintha * kuyimitsidwa.
Oyang'anira ndege akuyambitsa mpikisano wothamanga maulendo ataliatali ndi maulendo a njinga zamtunda. Ndikukwera Capra m'nkhalango zina zaumisiri kugombe lakum'mawa, sindingathe kudzifunsa kuti phukusili lingawonekere bwanji pamtunda waufupi, wopepuka, monga Canyon Neuron kapena YT Jeffsy - poyerekeza ndi mpikisano wopirira womangidwa mwapadera. zida. Yerekezerani. Malingana ndi nthawi yanga yochepa pa dongosolo, njinga mu gawo la 130-150 mm zidzapindula kwambiri ndi oyendetsa ndege; ukadaulo womwe umathandizira zoikamo zanjira zosiyanasiyana zomwe mungakwere. Pakalipano, mitundu iwiri yomwe ili pamwambayi ndi njira zanu zokha zamagalimoto opanda msewu ndi dongosolo ili; Ndikuganiza kuti tidikirira kuti tiwone ngati mitundu ina idzayambitsa maulendo afupiafupi ndi oyendetsa ndege m'nyengo yozizira ndi masika.
Iyi ndi ntchito yochititsa chidwi, ndipo yachitidwa bwino kwambiri: ndi yaying'ono, yanzeru, ndipo (mwina) yoyenera pafupifupi njinga zonse. Mpaka pano, ndiyosavuta kugwiritsa ntchito ndipo imawoneka yodalirika kwambiri.
Choyamba: woyendetsa ndege kapena valavu yamoyo? Ndakwera zonse, ndipo molingana ndi kukwera uku, ndikuganiza kuti adapangidwira zolinga zosiyanasiyana. Komabe, nthawi zambiri, ndikuganiza kuti Live Valve ikuchita zambiri nthawi zambiri. Live Valve ilinso yabata kwambiri. Koma woyendetsa ndegeyo ndi wosavuta komanso wokongola kwambiri, ndipo amasunga mawonekedwe otseguka a njinga ikatsika.
Makamaka ponena za oyendetsa ndege, ndiyamba ndi zoipa zanga. Kwa matekinoloje onse ochititsa chidwi, kwa ine, dongosololi ndikusintha kwatsopano kwa zotsekera zachikhalidwe. Poyerekeza ndi kutembenuza pamanja levers imodzi kapena zingapo, imatha kusintha masinthidwe mwachangu komanso pafupipafupi. Komabe, kwenikweni ndi mtundu wamagetsi wa Scott's TwinLoc kapena Specialized's BRAIN (ngakhale BRAIN ili / kuzimitsa, ndipo FA ndi njira zitatu) kukhazikitsa kwapamwamba kwambiri. Sindikutsimikiza ngati tatsegula madera atsopano kuchokera momwe amagwirira ntchito: zonsezi ndizosavuta. Kwa njinga zazifupi zoyendera - zoyenda pang'ono pokwera mapiri, makamaka njinga zazifupi zoyendera zokhala ndi njira zabwino zotsogola (DW-Link, VPP, Switch Infinity), sindikudziwa ngati FA ili ndi phindu lokwanira. Tsimikizirani kuti mtengo wofunikira ndi wololera. Imakhalanso yotsalira pang'ono, kotero nkhonya yoyamba pamene dongosolo latsekedwa ndi lakuthwa kwambiri. Constant ziirrp, zoorrp Ndiyenera kumvetsera pamene ndikukwera, chifukwa flip mode imakwiyitsanso. (Sindikumva potsika)
Kumbali yabwino, kumasuka ndi chinthu chabwino. Yendetsani zofewa, zofewa 165/170mm YT Capra kuti muziyenda kapena kutseka njira pokwera komanso njira zosalala. Zimapangitsa kuti zikhale zomveka bwino komanso zothandiza. Mukafika wamakhalidwe, simuyenera kuchita chilichonse kuti musangalale ndi kuyimitsidwa kwapamwamba kotsegulidwa. Chifukwa chachikulu chomwe nthawi zambiri sindigwiritsa ntchito loko ndikuti ndimayiwala kuti ndatsegula ndikuyamba kugwa ndikutseka kwanga. Kuphatikiza apo, kukwera kwanga kochuluka sikumakhala kosalala nthawi zonse, kotero sindikufuna kuvutikira kutembenuza foloko yanga ndi chotsitsa chododometsa pamamita 100 aliwonse. Chifukwa chake, ndikungotsegula kuyimitsidwa kwanga. Pogwiritsa ntchito FA, kachitidweko kasintha kachitidwe kumachitidwe omwe ndasankha. Ngati sindine waulesi kwambiri, komanso popanda cholowa chilichonse, nditha kulowa ndikutuluka mumitundu yosiyanasiyana mwachangu kuposa ine. Pazigawo zosalalazo, ndimapeza phindu la kuyimitsidwa kokhazikika, ndipo ndikakumana ndi mabwinja pamene ndikukwera, ndimapeza phindu la kuyimitsidwa kovutirapo.
Chifukwa chake, potengera momwe njinga imamverera, zosavuta komanso zowoneka bwino, ndikuganiza kuti FA ndiyopambana. Ndikuganizanso kuti izi ndizomveka kwa okwera omwe amakwera njinga zamtunda wautali ndikukwera kwambiri komanso kukwera, makamaka omwe ali ndi vuto lochepa la squat. Zitha kupangitsanso njinga zazitali zokopa chidwi kwa okwera omwe ali ndi chidwi ndi luso lawo, koma nkhawa ndi njira yokwerera yomwe nthawi zambiri imatsagana ndi njinga zokopa alendo.
Nthawi yotumiza: Oct-12-2021
